Physics GK · all questions

Light
practice.

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489

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Q481

Lens is made up of

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Q482

In fibre optics communication, the signal travels in the form of

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Q483

Persistance of vision is the principle behind

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Q484

Red light is used in traffic signals because

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Q485

A lady is standing in front of a plane mirror at a distance of 1 m from it. She walks 60 cm towards the mirror. The distance of her image now from herself (ignoring the thickness of the mirror) is

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Q486

An object is placed in front of a concave mirror at a point between its center of curvature and the focus point. Where will the image be formed?

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Q487

Assertion (A): The danger signal is made up of red colour.
Reason (R): Red colour is scattered the least.
Select the correct answer:

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Q488

Consider the following natural phenomena.
1. Terrestrial heating
2. Reflection of light
3. Refraction of light
4. Diffraction of light
Due to which of these phenomena is mirage formed?

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Q489

If a convex mirror is used to create a reflection of a real object, which of the following statements is false?

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