Ray and wave optics — reflection, refraction, lens/mirror formulae, interference, diffraction, polarization.
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Q1 · Ray Optics · MEDIUM
A thin convex lens of focal length 20 cm forms an image of an object placed 30 cm in front of it. The image distance is:
Q2 · Ray Optics · MEDIUM
The critical angle for total internal reflection in a medium of refractive index 1.5 (with respect to air) is approximately:
Q3 · Ray Optics · EASY
For a convex lens, an object of height 2 cm produces an image of height 6 cm. The magnification is:
Q4 · Wave Optics · EASY
In a Young's double-slit experiment the fringe width is β = λD/d. If the slit separation d is doubled (λ and D unchanged), the fringe width becomes:
Q5 · Optics · MEDIUM
A convex lens of focal length 20 cm forms a real image at a distance of 60 cm from the lens. What is the object distance from the lens?