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BINA LIBRARY-Optics-I-EXERCISE
- 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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- Why should a simple magnifying glass be placed closer to the eye ?
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- What is the best position for eye viewing an object through microscope...
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- Define beam of light.
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- Find the position of an object which when placed in front of a concave...
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- When an object is placed at a distance of 60 cm from a convex mirror, ...
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- An object is kept at 0.2 m from a convex lens of focal length 0.15 m. ...
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- A double convex lens made of glass of refractive index 1.5 has both ra...
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- Calculate the focal length of the combination of a convex lens of foca...
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- A converging lens has focal length of 20 cm in air. It is made of a ma...
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- Two lenses of powers, 15D and +5D are in contact with each other formi...
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