Physics GK · all questions

Light
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Q221

Two convex lenses with power 2 D are kept in contact with each other. The focal length of the combined lens system is

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Q222

Image formed by the plane mirror is

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Q223

Twinkling of stars is due to

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Q224

Find the position of the image formed by a concave mirror when the object is placed between P and F?

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Q225

The focal length of a convex lens is 50 cm. Calculate its power.

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Q226

The transverse nature of light waves is confirmed by

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Q227

What is the unit of refractive index?

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Q228

The part of the eye having the large refractive index is

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Q229

The refractive index of fused quartz is 1.46 and that of sapphire is 1.77. If V_q is the speed of light in quartz and V_s is the speed of light in sapphire, then which one of the following relations is correct?

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Q230

When an object is placed between C and F, where will the image form in a concave mirror?

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Q231

Which one of the following statement about the refractive index of a material medium with respect to air is correct?

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Q232

What does prism do?

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Q233

When an object is placed at the 2F₁ position of a convex lens, what is the size of the image?

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Q234

Optical fibres, though bent in any manner, allows light to pass through. What is the inference that one can draw from it?

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Q235

Which one of the following is the natural phenomenon based on a simple periscope works?

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Q236

The amount of light entering into eye can be controlled and regulated by . . . . . . . .

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Q237

The diameter of the reflecting surface of a spherical mirror is called a/an-

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Q238

The blue colour of water in the sea is due to

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Q239

What is the reason behind the extraordinary shining of the diamond cuts in a proper way?

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Q240

In a concave mirror if object is placed at centre of curvature then image will be . . . . . . . .

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