Question

If a convex lens of focal length of 5cm is used as simple micro scope than magnifying power will be

Answer 1

Explanation:

Whenever you get stuck in these type of questions, remember this:-

Convex Lens :-

• F +ve
• Real, Virtual Erect, diminished images can be formed.
• Power +ve

Now, remember this formula, a nice simple one :-

$\sf{Power = \dfrac{1}{Focal \ Length}}$

We just need to ay with this formula. What we will do is transfer Power to the opposite side and do the same with focal length.

$\sf{Focal \ Length = \dfrac{1}{Power}}$

Caution! Look at the units first. It's cm.

$\sf{Power = \dfrac{100}{Focal \ Length}}$

In case we have the units in cm.

$\sf{Power = \dfrac{100}{+ 5}}$

So, finally we will have the power as + 20 D or +20 Dioptre.

Answer 2

Question :-

If a convex lens of focal length of 5cm is used as simple micro scope than magnifying power will be ?

Given :-

• Focal length of 5cm

To find :-

• Find the simple microscope than magnifying power will be !

Formula :-

$\: \: \: \: \: \: \: \rm \purple\longmapsto{Power = \dfrac{1}{Focal \ Length}}$

We just need to ay with this formula. What we will do is transfer Power to the opposite side and do the same with focal length.

$\: \: \: \: \: \: \: \: \rm \purple\longmapsto{Focal \ Length = \dfrac{1}{Power}}$

$\: \: \: \: \: \: \: \: \: \: \purple\longmapsto \rm{Power = \dfrac{100}{Focal \ Length}}$

In case we have the units in cm.

$\: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \purple\longmapsto \rm{Power = \dfrac{100}{+ 5}}$

So, finally the power will be +20 Dioptre.