Question

A concave mirror forms image of an object placed in front of it,at a distance of 20 cm behind the mirror.If focal length of the mirror is 20 cm,then find the magnification.
Answer with explanation.

Answer 1

Answer:

HERE IS YOUR ANSWER

Explanation:

PLS. MARK ME AS BRAINLISTER

Answer 2

No image is formed and as no image there is no magnification.

Given,

Object length = -20cm

Focal length = -20cm.

To find,

Image length = ?

Formula to be used,

$\frac{1}{u} + \frac{1}{v} = \frac{1}{f}\\ \\ \frac{1}{-20} + \frac{1}{v} = \frac{1}{-20}\\ \\\frac{1}{v} = 0$

v = ∞.

• Concave mirrors are generally converging mirrors and they are recessed inward.
• Such, mirrors reflect light inside to a single focal point and are used to focus lights.
• Since, object is placed at focal length in concave mirror no image formation will take place.
• In such mirror when object is places at focal length image is formed at infinity so no image can be seen.

Therefore, no image is formed and as no image there is no magnification.