defence exam ITBP (Telecommunication) Head Constable Mock Test 2024 Physics Optics Refraction and Reflection
A convex lens of power 4D is placed at a distance of 40 cm from a wall. At what distance from the lens should a candle be placed so that its image is formed on the wall?
1
\(\frac{100}{3} \ cm\)
2
\(\frac{200}{3} \ cm\)
3
\(\frac{400}{3} \ cm\)
4
\(\frac{800}{3} \ cm\)