LIGHT, REFLECTION & REFRACTION

No matter how far you stand from a spherical mirror, your image appears erect. The mirror may be

• only plane

• only concave

• either plane or convex

• only convex

Power of’ a lens is the______of its focal length

A ………. lens will always give a virtual, erect and diminished image, irrespective of the position of the object.

A positive sign in the value of magnification indicates that the image is

• real

• virtual

• enlarged

• near

The SI unit of power is ........

A ray of light is travelling from a rarer medium to a denser medium. While entering the denser medium at the point of incidence, it

• goes straight into the second medium

• bends towards the normal

• bends away from the normal

• does not enter at all

If the image is formed in front of the mirror, then the image distance will be

• positive or negative depending on the size of the object

• neither positive nor negative

• positive

• negative

A ray of light coming parallel to the principal axis after passing through a convex lens, has passed through its

• optical centre

• focus

• center of curvature

• mid point

A spherical mirror and a thin spherical lens have focal length of −20 cm. The mirror and lens will be:

• both concave

• mirror is concave and lens is convex

• both convex

• mirror is convex and lens is concave

A small air bubble in a glass block when seen from above appears to be raised because of

• refraction of light

• reflection of light

• reflection and refraction of light

• none of the above