How does the action of a convex lens differ from that of a concave lens on a parallel beam of light incident on them? Draw diagram to illustrate your answer.

Open in App

Solution

In case of convex lens the upper part of the lens bends the incident ray downwards.
But in case of a concave lens the upper part of the lens bends the incident ray upwards and lower part bends the ray downwards while the central part passes the ray undeviated.

Suggest Corrections

Similar questions

Out of the two lenses, one concave and the other convex, state which one will show the divergent action on a light beam. Draw diagram to illustrate you answer.

Q. What effect does a convex lens have on parallel rays of light incident on it? In what way is the effect of a concave lens different?

A parallel oblique beam of light falls on a (i) convex lens, (ii) concave lens. Draw a diagram in each case to show the refraction of light through the lens.

Q. A convex lens of focal length

20 c m

and a concave lens of focal length

f

are mounted coaxially

5 c m

apart. Parallel beam of light incident on the convex lens emerges from the concave lens as a parallel beam. Then,

f

in cm is

Draw suitable diagrams to illustrate how a beam of light incident parallel to the principal axis is reflected by :

(a) a concave mirror, and (b) a convex mirror.

Join BYJU'S Learning Program

How does the action of a convex lens differ from that of a concave lens on a parallel beam of light incident on them? Draw diagram to illustrate your answer.

In case of convex lens the upper part of the lens bends the incident ray downwards.But in case of a concave lens the upper part of the lens bends the incident ray upwards and lower part bends the ray downwards while the central part passes the ray undeviated.

In case of convex lens the upper part of the lens bends the incident ray downwards.
But in case of a concave lens the upper part of the lens bends the incident ray upwards and lower part bends the ray downwards while the central part passes the ray undeviated.