Question

A small refracting telescope has an objective of focal length 100 cm. If the eyepiece

has a focal length of 4.0 cm, what is the magnification of the telescope?

A) 0.25 cm

B) 25 cm

C) 2.5 cm

D) 250 cm

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Answer 1

Given:-

• Objective Focal length ,fo = 100 cm

• Focal length of eyepiece ,fe = 4 cm

To Find:-

• Magnification ,m

Solution:-

We have to calculate the Magnification of the telescope .

Using Formula

• m = fo/fe

where,

fo denotes objective focal length

fe denotes focal length of eyepiece

m is the Magnification of telescope

Substitute the value we get

→ m = 100/4

→ m = 25 cm

Therefore,the magnification of the telescope is 25 cm.

Hence, the required option is (B) 25 cm.

Answer 2

$\huge{\boxed{\bold{Question}}}$

A small refracting telescope has an objective of focal length 100 cm. If the eyepiece

has a focal length of 4.0 cm, what is the magnification of the telescope?

A) 0.25 cm

B) 25 cm $\huge{\boxed{\bold{Answer}}}$

C) 2.5 cm

D) 250 cm

$\huge{\boxed{\bold{We have to find}}}$

•Magnification

$\huge{\boxed{\bold{Using formula}}}$

$\huge\mathbb\red{m=do/fe}$

m=fo/fe

m=100/4

m=25cm $\huge\mathbb\red{</strong><strong>Answe</strong><strong>r</strong><strong>}$