HARD
JEE Main
IMPORTANT
Earn 100
Two identical thin biconvex lenses of focal length and refractive index are in contact with each other. The space between the lenses is filled with a liquid of refractive index . The focal length of the combination is _____
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Important Questions on Ray Optics
HARD
JEE Main
IMPORTANT
A ray of light is incident at an angle of incidence on the glass slab of refractive index . After refraction, the light ray emerges out from other parallel faces and lateral shift between incident ray and emergent ray is . The thickness of the glass slab is _____ .
EASY
JEE Main
IMPORTANT
A light wave travelling linearly in a medium of dielectric constant , incidents on the horizontal interface separating medium with air. The angle of incidence for which the total intensity of incident wave will be reflected back into the same medium will be :
(Given : relative permeability of medium )
EASY
JEE Main
IMPORTANT
A signal of frequency can be transmitted with maximum efficiency by
EASY
JEE Main
IMPORTANT
The difference of speed of light in the two media and is . If the refractive index of medium is , then the ratio of refractive index of medium to medium is: (Given : speed of light in vacuum )
HARD
JEE Main
IMPORTANT
A small bulb is placed at the bottom of a tank containing water to a depth of . The refractive index of water is . The area of the surface of water through which light from the bulb can emerge out is . The value of is _____ .
HARD
JEE Main
IMPORTANT
A light ray is incident, at an incident angle , on the system of two plane mirrors and having an inclination angle between them (as shown in figure). After reflecting from mirror it gets reflected back by the mirror with an angle of reflection . The total deviation of the ray will be _____ degree.
MEDIUM
JEE Main
IMPORTANT
Consider a light ray travelling in air is incident into a medium of refractive index . The incident angle is twice that of refracting angle. Then, the angle of incidence will be
MEDIUM
JEE Main
IMPORTANT
A convex lens has power . It is cut into two halves along its principal axis. Further one piece (out of the two halves) is cut into two halves perpendicular to the principal axis (as shown in figures). Choose the incorrect option for the reported pieces.
