Q.

If two lenses of +5 dioptres are mounted at some distance apart, the equivalent power will always be negative if the distance is

see full answer

Talk to JEE/NEET 2025 Toppers - Learn What Actually Works!

Real Strategies. Real People. Real Success Stories - Just 1 call away
An Intiative by Sri Chaitanya

a

Greater than 40 cm

b

Equal to 40 cm

c

Equal to 10 cm

d

Less than 10 cm

answer is A.

(Unlock A.I Detailed Solution for FREE)

Ready to Test Your Skills?

Check your Performance Today with our Free Mock Test used by Toppers!

Take Free Test

Detailed Solution

Using  P=P1+P2−d×P1P2for  equivalent  power  to  be  negatived×P1P2>P1+P2⇒d×25>10⇒d>1025m⇒d>10×10025⇒d>40cm
Watch 3-min video & get full concept clarity
score_test_img

Get Expert Academic Guidance – Connect with a Counselor Today!

whats app icon
If two lenses of +5 dioptres are mounted at some distance apart, the equivalent power will always be negative if the distance is