A least distance of distinct vision is 25 cm. The focal length of a convex lens is 5 cm. It can act as a simple microscope of magnifying power

Question

A least distance of distinct vision is 25 cm. The focal length of a convex lens is 5 cm. It can act as a simple microscope of magnifying power (A) 4 (B) 5 (C) 6 (D) none of these

Tardigrade Admin · Accepted Answer

Magnifying power, m=1+(D/f) Given D=25 cm, f=5 cm ∴ m=1+(25/5) ⇒ m=1+5=6

Q. A least distance of distinct vision is 25 cm. The focal length of a convex lens is 5 cm. It can act as a simple microscope of magnifying power

4

5

6

none of these

Magnifying power, $m = 1 + \frac{D}{f}$ Given $D = 25 c m,$ $f = 5 c m$ $∴$ $m = 1 + \frac{25}{5}$ $\Rightarrow$ $m = 1 + 5 = 6$

Q. A least distance of distinct vision is 25 cm. The focal length of a convex lens is 5 cm. It can act as a simple microscope of magnifying power

4

5

6

none of these

Magnifying power, m=1+fD​ Given D=25cm, f=5cm ∴ m=1+525​ ⇒ m=1+5=6

Magnifying power, $m = 1 + \frac{D}{f}$ Given $D = 25 c m,$ $f = 5 c m$ $∴$ $m = 1 + \frac{25}{5}$ $\Rightarrow$ $m = 1 + 5 = 6$