Question

The image of an object placed at infinity will be highly diminished and point sized ?

Concave mirror only

Convex mirror only

Convex lens only

Concave mirror, convex mirror, concave lens and convex lens.

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Answer 1

Answer:

ANSWER

When rays of light coming from infinity are incident on a concave mirror, convex mirror, concave lens or a convex lens, a highly diminished image is formed at the focus as shown in the figure.

The same can be verified by using mirror equation and lens equation.

Mirror Equation:

v

1

+

u

1

=

f

1

Lens Equation:

v

1

−

u

1

=

f

1

Substituting u=−∞,v=f

Magnification m=v/u=f/∞=0

Hence, image is point sized.

Answer 2

all mirror and lenses is correct answer