Quiz

Five questions, randomized each time.

Question 1

Sign of focal length for a concave lens (Cartesian convention):

Question 2

If an object is placed between F₁ and the optical centre of a convex lens, the image is:

Question 3

Magnification m of an image is defined as:

Question 4

A burning glass focuses sunlight at:

Question 5

If magnification m is +0.5, the image is: