Physics MCQ

Assertion (A): When a ray of light passes from one medium to another medium, its frequency changes.
Reason (A): The frequency of light depends on the source of light.

A lens forms the image of an object placed at a distance 15 cm from it, at a distance 60 cm in front of it. The focal length of the lens is

A ray of light bends while passing from one transparent medium to another medium having different refractive indices. If the second medium is denser than first medium, then how does frequency change?

A total reflecting prism is used for the purposes

While doing experiment a student placed an object at a distance of 30 cm in front of a convex lens with focal length of 20 cm. Image distance will be between

The device that has been used by a person to read small letters is a

The wavelength range of white light is

There is no loss of energy in the phenomenon of:

The apparent depth of a liquid in a vessel is 15 cm, when its real depth is 20 cm. Find the refractive index of the liquid.

A double convex lens of focal length 'f' is cut into two equal parts. The focal length of each part will be:

Samir obtained a sharp image of the grill of a window on a screen, using a convex lens. He then thought of focusing a distant building instead of the grill. What should he do to obtain clear image on screen?

A sharp image of a distant object is obtained on a screen by using a convex lens. In order to determine the focal length of the lens, you need to measure the distance between the:

The point on the principal axis of a thin lens, such that a ray of light directed towards it, passes undeviated through it, is called:

The critical angle for a given pair of media depends on:

A stone placed at the bottom of a water tank appears raised by 80 cm. If the refractive index of water is 4/3, then the actual depth of water in the tank is:

A glass block 3.0 cm thick is placed over a stamp. The refractive index of glass is 1.54. Then the height through which the image of stamp raised will be:

The ratio of speeds of light of violet colour and red colour in vacuum is:

A given prism deviates the violet light

A convex lens will form a virtual, erect and enlarged image, when object is:

A lens forms an inverted image of an object equal to its own size. The object is:

The point on the principal axis of a convex lens, such that rays of light starting from it on passing through the lens move parallel to the principal axis is called:

When an equilateral prism is in minimum deviation position the angle of incidence is:

During spear fishing a fisherman aims at the:

During sunrise or sunset, the sun appears bigger because the rays of light coming from it pass through: