Hots Higher Order Thinking Skills Questions
Q.1. A child sitting in a classroom is not able to read clearly the writing on the blackboard.
a) Name the type of defect from which his eye is suffering.
b) With the help of a ray diagram show how this defect can be remedied?
Q.2. Why we have two eyes instead of one ?
Q.3. When one enters a dim-lit room from bright light, one is unable to see the object in the room for sometime. Explain, why?
Q.4. A person is able to see objects clearly only when these are lying at distances between 50 cm and 300 cm from his eye.
a) What kind of defect of vision is he suffering from?
b) What kind of lenses will he required to increase his range of vision from 25 cm to infinity? Explain.
Q.5. A student cannot read properly from the blackboard while sitting on the front desk in a classroom of a big size. He however, can read clearly while sitting on the last desk of the classroom.
a) Draw ray diagrams to illustrate the formation of image of the blackboard writing by his eyelens when he is seated at the (i) front desk, (ii) last desk.
b) Name the defect of the eye from which the student is suffering.
c) Name the type of lens that would enable him to see the blackboard writing clearly, when seated on the front desk. Draw a ray diagram to illustrate how this lens helps him to see clearly.
Q.6. A student finds the writing on the blackboard blurred and unclear while sitting on the last desk in a classroom. He however, sees it clearly while sitting on the front desk at about 2 m from the blackboard.
a) Draw ray diagrams to illustrate the formation of image of the blackboard writing by his eye lens when he is seated at the (j) last desk (ii) front desk.
b) Name the kind of lens that would help him to see clearly even when he is seated at the last desk. Draw a ray diagram to illustrate how this lens helps him to see clearly.
Q.7. A prism causes dispersion of white light while a rectangular glass block does not. Explain.
Q.8. A beam of white light falling on a glass prism gets split up into seven colours marked 1 to 7 as shown in the diagram. A student makes the ' ' following statements about the spectrum observed on the screen.
a) The colours at position marked 3 and 5 are similar to the colour of the core of a hard-boiled egg colour and the colour of the sky respectively. Is the statement made by the student correct or incorrect? Justify.
b) Which of the two positions correspond closely to the colour of (i) a solution of potassium permanganate (ii) danger or stop signal lights?
Q.9. Figure below shows the refraction of a ray through a prism. Copy the diagram and ignoring dispersion at the faces AB and AC. Mark the following angles : (i) The angle of incidence, (ii) The angle of refraction at the face AB (iii) The angle of emergence, (iv) The angle of deviation.
Q.10. Figure below shows a glass prism placed in minimum deviation position. A ray of monochromatic light is incident on its face AB. Copy the diagram and show
the refracted and the emergent ray. Mark the angle of deviation. State any two factors on which the angle of deviation depends.
Q.11. In the given figure, a ray of light PQ is incident normally on one face AB of an equilateral glass prism. What are the angles at faces AB and AC?
Q.12. A glass slab is placed over a page on which the word VIBGYOR is printed with each letter in its corresponding colour, (i) Will the image of all the letters be in the same place? (ii) If not, state which letter will be raised to the maximum. Give a reason for your answer.
Q.13. A prism causes dispersion of white light while a rectangular glass block does not. Explain.
Q.14. Write approximate wavelengths for (/) blue and (ii) red light. Which colour has the higher speed in vacuum? Which colour has the higher speed in glass?
Reasoning Questions
Q.1. A person can see clearly and read the hoardings on the roadside but is not able to read a book.
a) From which defect of the eye is he suffering ?
b) What type of the spectacle lens should be use to correct the defect?
Q.2. A short sighted person can read printed clearly held at a distance of 15 cm from the eye. He wants to read a book kept at a distance of 60 cm from the eye. What is the nature and focal length of the lens he requires?
Q.3. A hypermetropic eye can be corrected by using a convex lens of a suitable focal length. Explain.
Q.4. Under what conditions, the use of bifocal spectacles is recommended 7.
Q.5. A ray of light is incident on a prism in the minimum deviation position as shown and it suffers a deviation of 40°. What will be the deviation suffered if the shaded half of the prism is removed ?
Q.6. Why is that white light passing through a prism is split into its constituent colours although in air it travels as a single ray?
Q.7. Why is the order of colours reversed in a secondary rainbow from that in the primary rainbow?
Q.8. Arrange the names of the following colours : Yellow, Green, Blue, Red.
(i) in increasing order of their frequencies.
(ii) in increasing order of their wavelengths.
Q.9. Mention the names of the colours in the spectrum of sunlight having minimum and maximum frequencies.
Numerical Problems
Q.1. A person with a defective eyevision is unable to see the objects nearer than 1.5 m. He wants to read books at a distance of 30 cm. Find the nature, focal length and power of the lens he needs in his spectacles.
Q.2. The far point of a myopic person 80 cm in front of the eyes. What it the nature and power of the lens required to enable him to see very distant objects distinctly ?
Q.3. Far point of a myopic person is 40 cm. What type of lens should he wear so as to see the distant object clearly? Calculate the focal length and the power of the lens he should use.
Q.4. A myopic person has been using spectacles of power -1.00 D for clear vision. During old age he also needs to use separate reading glasses of power + 2.00 D. Explain what may have happened to his eyesight ?
Q.5. The far point of a myopic person is 150 cm in front of the eye. Calculate the focal length and the power of a lens required to enable him to see distant objects clearly.
Q.6. A person needs a lens of power - 5.5 D for correcting his distant vision. For correcting his near vision, he needs a lens of power + 1.5 D. What is the focal length of the lens required for correcting :
(i) distant vision (ii) near vision?
Q.7. The far point of a myopic person is 80 cm in front of the eye. What is the nature and power of the lens required to correct the problem?
Q.1. A child sitting in a classroom is not able to read clearly the writing on the blackboard.
a) Name the type of defect from which his eye is suffering.
b) With the help of a ray diagram show how this defect can be remedied?
Q.2. Why we have two eyes instead of one ?
Q.3. When one enters a dim-lit room from bright light, one is unable to see the object in the room for sometime. Explain, why?
Q.4. A person is able to see objects clearly only when these are lying at distances between 50 cm and 300 cm from his eye.
a) What kind of defect of vision is he suffering from?
b) What kind of lenses will he required to increase his range of vision from 25 cm to infinity? Explain.
Q.5. A student cannot read properly from the blackboard while sitting on the front desk in a classroom of a big size. He however, can read clearly while sitting on the last desk of the classroom.
a) Draw ray diagrams to illustrate the formation of image of the blackboard writing by his eyelens when he is seated at the (i) front desk, (ii) last desk.
b) Name the defect of the eye from which the student is suffering.
c) Name the type of lens that would enable him to see the blackboard writing clearly, when seated on the front desk. Draw a ray diagram to illustrate how this lens helps him to see clearly.
Q.6. A student finds the writing on the blackboard blurred and unclear while sitting on the last desk in a classroom. He however, sees it clearly while sitting on the front desk at about 2 m from the blackboard.
a) Draw ray diagrams to illustrate the formation of image of the blackboard writing by his eye lens when he is seated at the (j) last desk (ii) front desk.
b) Name the kind of lens that would help him to see clearly even when he is seated at the last desk. Draw a ray diagram to illustrate how this lens helps him to see clearly.
Q.7. A prism causes dispersion of white light while a rectangular glass block does not. Explain.
Q.8. A beam of white light falling on a glass prism gets split up into seven colours marked 1 to 7 as shown in the diagram. A student makes the ' ' following statements about the spectrum observed on the screen.
a) The colours at position marked 3 and 5 are similar to the colour of the core of a hard-boiled egg colour and the colour of the sky respectively. Is the statement made by the student correct or incorrect? Justify.
b) Which of the two positions correspond closely to the colour of (i) a solution of potassium permanganate (ii) danger or stop signal lights?
Q.9. Figure below shows the refraction of a ray through a prism. Copy the diagram and ignoring dispersion at the faces AB and AC. Mark the following angles : (i) The angle of incidence, (ii) The angle of refraction at the face AB (iii) The angle of emergence, (iv) The angle of deviation.
Q.10. Figure below shows a glass prism placed in minimum deviation position. A ray of monochromatic light is incident on its face AB. Copy the diagram and show
the refracted and the emergent ray. Mark the angle of deviation. State any two factors on which the angle of deviation depends.
Q.11. In the given figure, a ray of light PQ is incident normally on one face AB of an equilateral glass prism. What are the angles at faces AB and AC?
Q.12. A glass slab is placed over a page on which the word VIBGYOR is printed with each letter in its corresponding colour, (i) Will the image of all the letters be in the same place? (ii) If not, state which letter will be raised to the maximum. Give a reason for your answer.
Q.13. A prism causes dispersion of white light while a rectangular glass block does not. Explain.
Q.14. Write approximate wavelengths for (/) blue and (ii) red light. Which colour has the higher speed in vacuum? Which colour has the higher speed in glass?
Reasoning Questions
Q.1. A person can see clearly and read the hoardings on the roadside but is not able to read a book.
a) From which defect of the eye is he suffering ?
b) What type of the spectacle lens should be use to correct the defect?
Q.2. A short sighted person can read printed clearly held at a distance of 15 cm from the eye. He wants to read a book kept at a distance of 60 cm from the eye. What is the nature and focal length of the lens he requires?
Q.3. A hypermetropic eye can be corrected by using a convex lens of a suitable focal length. Explain.
Q.4. Under what conditions, the use of bifocal spectacles is recommended 7.
Q.5. A ray of light is incident on a prism in the minimum deviation position as shown and it suffers a deviation of 40°. What will be the deviation suffered if the shaded half of the prism is removed ?
Q.6. Why is that white light passing through a prism is split into its constituent colours although in air it travels as a single ray?
Q.7. Why is the order of colours reversed in a secondary rainbow from that in the primary rainbow?
Q.8. Arrange the names of the following colours : Yellow, Green, Blue, Red.
(i) in increasing order of their frequencies.
(ii) in increasing order of their wavelengths.
Q.9. Mention the names of the colours in the spectrum of sunlight having minimum and maximum frequencies.
Numerical Problems
Q.1. A person with a defective eyevision is unable to see the objects nearer than 1.5 m. He wants to read books at a distance of 30 cm. Find the nature, focal length and power of the lens he needs in his spectacles.
Q.2. The far point of a myopic person 80 cm in front of the eyes. What it the nature and power of the lens required to enable him to see very distant objects distinctly ?
Q.3. Far point of a myopic person is 40 cm. What type of lens should he wear so as to see the distant object clearly? Calculate the focal length and the power of the lens he should use.
Q.4. A myopic person has been using spectacles of power -1.00 D for clear vision. During old age he also needs to use separate reading glasses of power + 2.00 D. Explain what may have happened to his eyesight ?
Q.5. The far point of a myopic person is 150 cm in front of the eye. Calculate the focal length and the power of a lens required to enable him to see distant objects clearly.
Q.6. A person needs a lens of power - 5.5 D for correcting his distant vision. For correcting his near vision, he needs a lens of power + 1.5 D. What is the focal length of the lens required for correcting :
(i) distant vision (ii) near vision?
Q.7. The far point of a myopic person is 80 cm in front of the eye. What is the nature and power of the lens required to correct the problem?
