SATHEE: Optics Question 107

Optics Question 107

Question: A point object is moving on the principal axis of a concave mirror of focal length $24 c m$ towards the mirror. When it is at a distance of $60 c m$ from the mirror, its velocity is $9 c m / s e c .$ What is the velocity of the image at that instant

[MP PMT 1997]

Options:

A) $5 c m / s e c$ towards the mirror

B) $4 c m / s e c$ towards the mirror

C) $4 c m / s e c$ away from the mirror

D) $9 c m / \sec$ away from the mirror

Show Answer

Answer:

Correct Answer: C

Solution:

$v_{i} = - {(\frac{f}{f - u})}^{2} . v_{o}$

$= - {(\frac{- 24}{- 24 - (- 60)})}^{2} \times 9$ = 4 cm/sec.

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Optics Question 107

Question: A point object is moving on the principal axis of a concave mirror of focal length 24cm towards the mirror. When it is at a distance of 60cm from the mirror, its velocity is 9cm/sec. What is the velocity of the image at that instant

Options:

Answer:

Solution:

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Question: A point object is moving on the principal axis of a concave mirror of focal length $24 c m$ towards the mirror. When it is at a distance of $60 c m$ from the mirror, its velocity is $9 c m / s e c .$ What is the velocity of the image at that instant