Aman standing 1.54 m in front of a shaving mirror produces a real, inverted image 15.2 cm from it. what is the focal length of the mirror? (b) how close to the mirror should he stand if he wants to form an upright image of his chin that is twice the chin's actual size?

The focal length is 16.86 cm and the distance of the man  if he wants to form an upright image of his chin that is twice the chin's actual size is 8.43 cm.

Explanation:

Given that,

Object distance u=1.54 m =154 cm

Image distance v = 15.2 cm

Magnification = 2

We need to calculate the focal length

Using formula of mirror

Put the value into the formula

We need to calculate the focal length

Using formula of magnification

Put the value into the formula

Using formula of for focal length

Hence, The focal length is 16.86 cm and the distance of the man  if he wants to form an upright image of his chin that is twice the chin's actual size is 8.43 cm.

measure their densities same density, same sub

t = 1/400 h   ⇔ 0.0025 h ⇔ 9s ⇔ 0.15 m

any of the answers are correct.