Reflection, refraction, lenses, mirrors, prisms, optical instruments, wave optics — interference, diffraction, polarisation.
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Q1 · Optics · EASY
A convex lens of focal length 20 cm forms an image at a distance of 60 cm from the lens. What is the distance of the object from the lens?
Q2 · Optics · MEDIUM
In Young's double-slit experiment, the distance between the two slits is 0.5 mm and the screen is placed 1 m away from the slits. If light of wavelength 500 nm is used, what is the fringe width (distance between consecutive bright fringes)?
Q3 · Optics · MEDIUM
A ray of light is incident on a glass slab (refractive index 1.5) at an angle of 60° to the normal. What is the angle of refraction inside the glass? (Given: sin 60° = 0.866, sin 35.26° = 0.577)
Q4 · Optics · HARD
A diffraction grating has 5000 lines per centimeter. When light of wavelength 600 nm is incident normally on the grating, what is the angle of the second-order maximum? (Given: sin 36.87° = 0.6)
Q5 · Optics · HARD
A convex lens of focal length 20 cm is placed in contact with a concave lens of focal length -30 cm. What is the power of the combination?