Physicshard · Past Paper
A lens of power +5 D is submerged in a liquid of refractive index equal to that of the lens material. Its power becomes:
A+5 D
B-5 D
CZero
DInfinite
✓ Correct Answer: C — Zero
If n(lens) = n(medium), the light does not bend, so the lens acts as a plane sheet with zero power.
Share this question
More from Physics
- Which sound wave property changes when the source moves relative to the observer (Doppler Effect)?
- A ray of light enters a glass slab perpendicularly (at 90 degrees to the surface). The angle of refraction is:
- The heating element of an electric iron is made of:
- When a force acts at an angle of 180 degrees to displacement, the work done is:
- Which of the following is the formula for Kinetic Energy?