Question

The image of a distant object is obtained on a screen by using a concave mirror. The focal length
of the mirror can be determined by measuring the distance between : [1]
(a) the object and the mirror
(b) the object and the screen
(c) the mirror and the screen
(d) the mirror and the screen as well as that between the object and the screen

Answer 1

Given that,

The image of a distant object is obtained on a screen by using a concave mirror.

We know that,

When the object at placed in infinity then the rays will pass through the focus.

The image will be formed at focus.

So, the focal length  of the mirror can be determined by measuring the distance between the screen and the mirror.

Hence, (c) is the correct option.

Answer 2

Answer:

Hy your requered answer is here

Explanation:

The correct answer is [c].

Hope it is right.