A)The magnifying power of a simple microscope is 6. The focal length of its lens in meters will be ? (Least distance of distinct visionis 25cm)
A. 0.05
B.0.06
C.0.25
D.0.12
B) the focal length of one lens is -40 cm and that if the other is +20 cm . The foxal length of this combination wil be
A.15.2cm
B.40cm
C.-40cm
D.35cm
areebah:
I want solutions to both of these questions :) thanks
Answers
Answered by
3
Answer:
A) Option A 0.05
B) Option B 40 cm
Explanation:
(A) Magnification of the lens
Least distance of Distinct vision
cm
We know that if focal length of the lens is f then
cm
cm
or, m
(B) Given two focal lengths
cm
cm
Power of the lens is reciprocal of the focal length
Power of the lenses will be
Combined power of the lens
Therefore, the combined focal length will be
cm
Hope this helps.
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