Two convex lenses of focal lengths 0.03 m and 0.05 m are used to make a telescope. The distance kept between the two in order to obtain an image at infinity is
a)
0.35 cm
b)
0.25 cm
c)
0.175 m
d)
0.15 m
Two convex lenses of focal lengths 0.03 m and 0.05 m are used to make a telescope. The distance kept between the two in order to obtain an image at infinity is
a)
0.35 cm
b)
0.25 cm
c)
0.175 m
d)
0.15 m
Question ID - 152485 | SaraNextGen Top Answer
Two convex lenses of focal lengths 0.03 m and 0.05 m are used to make a telescope. The distance kept between the two in order to obtain an image at infinity is
a)
0.35 cm
b)
0.25 cm
c)
0.175 m
d)
0.15 m
|
Two convex lenses of focal lengths 0.03 m and 0.05 m are used to make a telescope. The distance kept between the two in order to obtain an image at infinity is |
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|
a) |
0.35 cm |
b) |
0.25 cm |
c) |
0.175 m |
d) |
0.15 m |
1 Answer
127 votes
Answer Key / Explanation : (a) -
|
(a) When the final image is formed at infinity by a telescope, it is called in normal adjustment and then length of the telescope is given by
Where
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is the focal length of objective lens and 
is the focal length of eye-piece
127 votes
Answer Link
127