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Class 12 Physics Practice Test: Optical Instruments
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Avg score: 64% • Most missed: “A boy uses spectacles of focal length -50 cm. Name the defect of the vision he i…”
Class 12 Physics Practice Test: Optical Instruments
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10 Questions

1. ‘X’ can see objects in the ultra-violet light while human beings cannot do so. Identify X.
2. Two lenses of focal lengths 5 cm and 50 cm are to be used for making a telescope. Which lens will you use for the objective?
3. What focal length should the reading spectacles have for a person for whom the least distance of distinct vision is 50 cm?
4. ‘X’ can see objects in the ultra-violet light while human beings cannot do so. Identify X.
5. An object is to be seen through a simple microscope of power 10 D. Where should the object be placed to reduce maximum angular magnification? The least distance for distinct vision is 25 cm.
6. How much intensity of the image is increased if the diameter of the objective of a telescope is doubled?
7. The upper part of the bi-focal lens is a convex lens while its lower part is a concave lens.
8. A boy uses spectacles of focal length -50 cm. Name the defect of the vision he is suffering from.
9. A fly is sitting on the objective of a telescope. What will be its effect on the final image of the distant object?
10. An object is to be seen through a simple microscope of power 10 D. Where should the object be placed to reduce maximum angular magnification? The least distance for distinct vision is 25 cm.

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