Lenses Practice 2
10 problems · instant feedback · full explanations
Lenses refract. Converging lenses can make real images; diverging lenses only virtual ones. The lens equation 1/f = 1/do + 1/di rules them all.
Q1.
Which lens can form a real image of a distant object?
Multiple choice · Easy
Q2.
An object 0.3 m from a converging lens forms an image 0.3 m beyond it. What is the focal length? (m)
Numerical answer (m) · Medium
Q3.
A diverging lens always forms:
Multiple choice · Medium
Q4.
A lens with f = 0.5 m has what power?
Multiple choice · Easy
Q5.
Object at 0.1 m from a converging lens with f = 0.2 m. Find the image distance. (m)
Numerical answer (m) · Hard
Q6.
di = 0.3 m, do = 0.6 m. What are the magnification and orientation?
Multiple choice · Medium
Q7.
Diverging lenses correct nearsightedness (myopia).
True / False · Easy
Q8.
A virtual image can be projected onto a screen.
True / False · Medium
Q9.
A +3 diopter lens is placed in contact with a −1 diopter lens. What is the total power? (diopters)
Numerical answer (diopters) · Hard
Q10.
In a simple glass lens, which color focuses closest to the lens?
Multiple choice · Hard