Physics GK · all questions

Light
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Q181

In optics, the refractive index of a substance is described by the formula

n = \frac{c}{v}

, where c is

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Q182

In which direction the rainbow is seen at 12 noon?

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Q183

Which of the following statements is true when we see rainbow?

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Q184

A person holding a pen in his left hand sees his reflection in the mirror holding the pen in his right hand. This is due to which of the following phenomena?

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Q185

If objects appear enlarged and inverted in a rear view mirror, then which type of mirror is used?

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Q186

At what medium does light travel maximum speed?

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Q187

Find the distance of an object from a concave mirror whose focal length is 10 cm so that the distance of image from mirror is four times the distance of the object will be-

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Q188

A soap bubble shows colours when illuminated with white light. This is due to . . . . . . . .

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Q189

Speed of light . . . . . . . . is.

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Q190

The mirror always produces an image of the object that is virtual, large and of equal size.

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Q191

In total internal reflection, the light travels from

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Q192

Fibre optics work on the principle of

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Q193

. . . . . . . . lenses are used by people suffering from myopia-

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Q194

One can distinguish a telescope from a microscope by observing

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Q195

Which one of the following statement is correct?

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Q196

Red' is used as a danger signal because

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Q197

When beams of red, blue and green lights fall on the same spot, the colour of the light becomes

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Q198

The concept of expanding universe is based on

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Q199

When a convex lens produces a real image of an object, the minimum distance between the object and image is equal to

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Q200

. . . . . . . . lenses are used by people suffering from hypermetropia.

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