GRE Subject 2026 Practice Test Physics Optics Free Quiz 1

1. What does optics deal with?

A. Light and its properties B. Motion of objects C. Electricity and magnetism D. Heat and temperature

2. What is the bouncing back of light from a surface?

A. Refraction B. Diffraction C. Reflection D. Interference

3. What is the bending of light as it passes from one medium to another?

A. Reflection B. Diffraction C. Interference D. Refraction

4. What occurs when the angle of incidence exceeds the critical angle?

A. Reflection B. Refraction C. Total internal reflection D. Diffraction

5. What type of mirror is a converging mirror?

A. Convex B. Plane C. Spherical D. Concave

6. What type of mirror is a diverging mirror?

A. Concave B. Convex C. Plane D. Spherical

7. What is the mirror equation?

A. 1/f = 1/v + 1/u B. 1/f = 1/v - 1/u C. 1/f = 1/u - 1/v D. f = uv/(u+v)

8. What type of lens is a diverging lens?

A. Convex B. Plane C. Cylindrical D. Concave

9. What is magnification?

A. m = -v/u (mirrors), m = v/u (lenses) B. m = u/v C. m = -u/v D. m = v/u

10. What is the superposition of waves?

A. Reflection B. Refraction C. Interference D. Diffraction