Reflection and refraction of light at plane and spherical surfaces; mirror formula; total internal reflection and its applications; refraction at spherical surfaces, lenses, thin lens formula; magnification; power of a lens; combination of thin lenses; refraction and dispersion through a prism; scattering of light; optical instruments — microscope and telescope; wave optics — Huygens' principle; interference, Young's double slit experiment; diffraction at single slit; polarisation; Brewster's law; Malus' law.
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Q1 · Optics · EASY
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?
Q2 · Optics · MEDIUM
In Young's double slit experiment, the distance between the slits is 0.5 mm and the screen is placed 1 m away. If the wavelength of light used is 600 nm, what is the fringe width?
Q3 · Optics · EASY
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?
Q4 · Optics · MEDIUM
An unpolarised light of intensity I0 is incident on a polaroid. Another polaroid is placed with its axis at 60° to the first. What is the intensity of light emerging from the second polaroid?
Q5 · Optics · HARD
A compound microscope has an objective of focal length 2 cm and an eyepiece of focal length 5 cm. If the distance between the lenses is 20 cm and the final image is formed at infinity, what is the magnifying power of the microscope?