A simple microscope has a magnifying power of 3.0 when the image in formed at the near point (25 cm) of a normal eye. What is its focal length?

10 cm

No worries! We‘ve got your back. Try BYJU‘S free classes today!

22.5 cm

No worries! We‘ve got your back. Try BYJU‘S free classes today!

12.5 cm

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

6 cm

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct option is C 12.5 cm

Given:
m=3, D = 25 cm

We have the magnifying power formula as below:
m=1+D/f

Putting the values, we get f = 12.5 cm

Suggest Corrections

Similar questions

Q. A simple microscope has a magnifying power of

3.0

when the image is formed at the near point

(25 cm)

of a normal eye. What is its focal length?

A simple microscope has a magnifying power of 3.0 when the image in formed at the near point (25 cm) of a normal eye. (a) What is its focal length? (b) What will be its magnifying power if the image is formed at infinity?

Q. A simple microscope has a magnifying power of

3.0

when the image is formed at the near point of a normal eye. What is its focal length?

Q. The magnifying power of a simple microscope when the final image is formed at

D = 25 cm

from eye is :
(

f

is the focal length)

Q. A compound microscope has a magnifying power

48

. The focal length of its eye-piece is

5 c m

. If final image is formed at least distance of distinct vision

(25 c m)

then magnification of objective lens is

Join BYJU'S Learning Program

A simple microscope has a magnifying power of 3.0 when the image in formed at the near point (25 cm) of a normal eye. What is its focal length?

The correct option is C 12.5 cm Given: m=3, D = 25 cm We have the magnifying power formula as below: m=1+D/f Putting the values, we get f = 12.5 cm

The correct option is C 12.5 cm

Given:
m=3, D = 25 cm

We have the magnifying power formula as below:
m=1+D/f

Putting the values, we get f = 12.5 cm