Question

The focal length of the concave mirror in the experimental setup shown, equals

(a) 10.3 cm (b) 11 cm (c) 11.7 cm (d) 12.2 cm

Answer 1

Focal length = -11.7 cm

Explanation:

We know that the focal length of the mirror in the experimental setup is equal to the difference between focus and the mirror. The attached figure shows the setup.

Focal length = focus - mirror distance

Focal length = 4.3 cm - 16 cm

Focal length = -11.7 cm

So, the focal length of the concave mirror is 11.7 cm. Hence, this is the required solution.

Learn more :

Focal length of concave mirror

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Answer 2

In the displayed experimental setup, the focal length of the concave mirror would be 11 cm

Explanation:

As we know that,

The focal length associated with the mirror as displayed in the mirror would be determined through the difference that lies between the focus(where the image formed) and the

Focal length = concave mirror's distance(P) - position of screen

$f$ $= 15.6 - 4.6$

∵ $f = 11 cm$

Thus, option B i.e. 11cm being the focal length of the concave mirror is the correct answer.

Learn more: Concave Mirror

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