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BINA LIBRARY-Optics-I-EXERCISE
- Write two advantages of a reflecting telescope over a refracting teles...
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- Modern telescope prefer using mirrors over using suitable lenses. Give...
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- Concave mirrors are used as shaving mirrors. Why?
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- Give reasons why convex mirrors are generally used as driving mirrors.
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- How will you distinguish between plane, concave and convex mirrors?
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- If a concave mirror is held in water, will its focal length change as ...
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- Bubbles of air coming out through water in glass vessel appears silver...
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- Name a mirror that can give an erect and enlarged image of an object.
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- Does the focal length of a lens depends on the medium in which it is i...
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- Is it possible for a given lens to act as a converging lens in one med...
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- Why goggles(sun glasses) have zero power even though their surfaces ar...
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- Does the focal length of a lens change if instead of blue light, monoc...
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- A thin converging lens has a focal length 'f in air. If it is complete...
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- Explain why rainbow is never seen on the surface of the moon.
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- Explain why is the sun visible a little before actual sunrise and a li...
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- Explain the origin of the blue colour of sky.
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- Explain why the setting sun looks red?
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- Why is red light used as a danger signal ?
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- Explain why yellow head-lights are used in cars in foggy weather.
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- In order to take colour photograph of a planet, what kind of telescope...
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