Physics GK · all questions

Light
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Q461

When a person enters into a dark room from the strong light area, he is not able to see clearly for some time. Later he gradually begins to see things. This is because

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Q462

The point at which all the rays meet is called . . . . . . . .

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Q463

For a ray of light to suffer total internal reflection, it has to pass from

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Q464

A person is unable to read a newspaper without his glasses. He is most probably suffering from

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Q465

What is the principal focus of a spherical mirror?

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Q466

A spherical mirror and a thin spherical lens each have a focal length of -20 cm. Which of the following is likely to be true in such a scenario?

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Q467

When the sun is near the horizon during the morning or evening, it appears reddish. The phenomenon that is responsible for this observation is

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Q468

In case of reflection, it is well known that, when a mirror turned through an angle the reflected ray turns through

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Q469

When light enters the denser medium through rarer medium, it is slow and . . . . . . . .

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Q470

The speed of light in vacuum is estimated to be . . . . . . . . m/s.

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Q471

When light passes from one medium to another, this phenomenon of change in its direction is called . . . . . . . .

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Q472

Which of the following is not a example of refraction of light?

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Q473

If an object is placed at the center of curvature of a concave mirror, its image will be such that-

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Q474

An object is placed in front of a convex mirror. Which one of the following statement is correct?

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Q475

When an object is placed at infinity in front of a concave mirror, its image is at-

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Q476

The objects that themselves do not produce light is called-

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Q477

The ratio of the height of image to the height of the object is called-

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Q478

The region where all of the light from the source is blocked is called:

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Q479

The shape of the image produced by a converging mirror when an object is placed at the main focus, it happens . . . . . . . . .

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Q480

Myopia is the same as

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