JEE Main · Physics
Ray optics and optical instruments
22 practice questions, each with the answer and an explanation.
Practise Ray optics and optical instruments now
Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.
All 22 questions
- An object is placed at a distance of in front of a concave spherical mirror of focal length . What is the position and nature of the image formed?
- A biconvex thin lens made of glass with refractive index has radii of curvature and . What is the focal length of the lens in air?
- What is the critical angle for total internal reflection at a glass-water interface, if the refractive index of glass is and that of water is ?
- Two thin convex lenses of focal lengths and are placed in coaxial contact. What is the optical power of the combination in diopters?
- A prism of refracting angle produces a minimum angle of deviation . What is the refractive index of the prism material?
- An astronomical telescope in normal adjustment has an objective lens of focal length and an eyepiece of focal length . What is the magnifying power and…
- A compound microscope has an objective of focal length and an eyepiece of focal length . An object is placed at a distance from the…
- A tank is filled with water () to a depth of . What is the apparent depth of a coin resting on the bottom when viewed from directly above?
- A glass slab of refractive index and thickness is placed over a printed page. By what distance do the printed letters appear to be raised when viewed normally?
- When a biconvex lens of focal length made of glass () is completely immersed in water (), what is its new focal length ?
- A convex lens of focal length is cut horizontally into two equal halves along its principal axis. What is the focal length of each individual half-lens?
- What is the angle of incidence on a prism of refracting angle and refractive index such that the ray inside the prism travels parallel to its base at minimum deviation?
- A real object is placed at a distance from the optical center of a convex lens of focal length . If the linear magnification is (real, inverted image of double size), what is the objec…
- The refractive index of the material of a convex lens is . If the radii of curvature of both surfaces are equal to each (equiconvex lens), what is the focal length of the lens?
- A ray of light enters a glass prism of refractive index normally on one face. What is the maximum refracting angle of the prism such that the ray does NOT suffer total internal reflecti…
- In a simple microscope, a magnifying glass of focal length is used to view a small object. What is its angular magnification when the image is formed at the near point (…
- A ray of light traveling in air strikes the surface of a glass plate of refractive index at the polarizing angle (Brewster's angle). What is the angle of refraction inside the glass?
- What is the ratio of focal length of a plano-convex lens () to that of an equiconvex lens () made from the same glass material?
- A convex lens produces a real inverted image of an object on a screen placed from the object. There are two positions of the lens between object and screen that form sharp images on th…
- A ray of light traveling from denser medium to rarer medium is incident at the critical angle. What is the angle of deviation experienced by the ray?
- An achromatic doublet is constructed by combining two thin lenses in contact of focal lengths and made of glasses with dispersive powers and . What is the condition fo…
- What is the speed of light in a diamond crystal having a refractive index of ? (Speed of light in vacuum )