Light, Reflection and Refraction

When light falls on a smooth polished surface, most of it

• is reflected in the same direction

• is reflected in different directions

• is scattered

• is refracted into the second medium

Tags

NGSS.MS-PS4-2

A student does the experiment on tracing the path of a ray of light passing through a rectangular glass slab for different angles of incidence. He can get a correct measure of the angle of incidence and the angle of emergence by following the labelling indicated in figure:

• I

• II

• III

• IV

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

• positive

• negative

• neither positive nor negative

When the object is placed between f and 2f of a convex lens, the image formed is

• at f

• at 2f

• beyond 2f

• between O and f

A spherical mirror and a spherical lens each have a focal length of -10 cm. The mirror and the lens are likely to be

• the mirror is convex and the lens is concave

• the mirror is concave and the lens is convex

• both convex

• both concave

Focal length of a concave mirror is

• negative

• positive

• depends on the position of object

• depends on the position of image

The image formed by a convex lens can be

• virtual image is not formed

• virtual and of same size

• virtual and diminished

• virtual and magnified

If an incident ray passes through the focus, the reflected ray will

• pass through the pole

• be parallel to the principal axis

• retrace its path

• pass through the center of curvature

The speed of light in vacuum is

• $3\times10^8m/s$

• $2.8\times10^8m/s$

• $3\times10^7m/s$

• $3\times10^9m/s$

Tags

NGSS.HS-PS4-1

Power of a lens is the ………. of its focal length.

• value

• reciprocal

• 2 times

• half