SATHEE: Optics Question 376

Optics Question 376

Question: A simple telescope, consisting of an objective of focal length 60 cm and a single eye lens of focal length 5 cm is focussed on a distant object is such a way that parallel rays comes out from the eye lens. If the object subtends an angle 2o at the objective, the angular width of the image

[CPMT 1979; NCERT 1980; MP PET 1992; JIPMER 1997; UPSEAT 2001]

Options:

A) 10o

B) 24o

C) 50o

D) 1/6o

Show Answer

Answer:

Correct Answer: B

Solution:

Since $m = \frac{f_{o}}{f_{e}}$ Also $m = \frac{A n g l e s u b t e n d e d b y t h e i m a g e}{A n g l e s u b t e n d e d b y t h e o b j e c t}$

$∴ \frac{f_{o}}{f_{e}} = \frac{α}{β}$

$\Rightarrow α = \frac{f_{o} \times β}{f_{e}} = \frac{60 \times 2}{5} = 24^{o}$

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Optics Question 376

Question: A simple telescope, consisting of an objective of focal length 60 cm and a single eye lens of focal length 5 cm is focussed on a distant object is such a way that parallel rays comes out from the eye lens. If the object subtends an angle 2o at the objective, the angular width of the image

Options:

Answer:

Solution:

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