383

You visited us 383 times! Enjoying our articles? Unlock Full Access!

Image Formation in Convex Mirror

A double conv...

Question

A double convex lens $(R_{1} = R_{2} = 100 c m)$ having focal length equal to the focal length of a concave mirror is

10 cm

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

20 cm

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

40 cm

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

15 cm

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

Open in App

Solution

The correct option is C 20 cm
As we know,
$\frac{1}{f} = (μ - 1) (\frac{1}{R_{1}} - \frac{1}{R_{2}})$
$= (1.5 - 1) (\frac{1}{10} + \frac{1}{10}) = \frac{1}{10} \Rightarrow f = 10 c m$
$∴$ Radius of curvature of concave mirror $= 2 f = 20 c m$

Suggest Corrections

Similar questions

(μ = 1.5)

(μ = 4 / 3)

\frac{1}{f} = \frac{μ_{l} - μ_{m}}{μ_{m}} (\frac{1}{R_{1}} - \frac{1}{R_{2}})

40 c m

12 c m

18 c m

60 c m,

d

Which of the following lenses would you prefer to use while reading small letters found in a dictionary?

(a) A convex lens of focal length 50 cm

(b) A concave lens of focal length 50 cm

(d) A concave lens of focal length 5 cm

Join BYJU'S Learning Program