Teaching Rajasthan 3rd Grade REET Mains (Level I & II) Mock Test Physics Optics Refraction and Reflection
The power of a lens is +2.5 D. What kind of lens is it and what is its focal length?
1
Convex lens, 40 cm
2
Concave lens, 100 cm
3
Convex lens, 50 cm
4
Concave lens, 40 cm