List of top Physics Questions on Ray optics and optical instruments asked in COMEDK UGET

If two thin lenses with focal lengths of +10 cm and +20 cm are placed in contact, what is the total power of the combination?

A plano-convex lens made of refractive index \(1.5\) and having radius of curvature \(R = 4\,\text{cm}\) fits exactly into a plano-concave lens made of refractive index \(1.3\) and having the same radius of curvature \(R = 4\,\text{cm}\) such that their plane surfaces are parallel to each other. The focal length of the combination is:

An object of height \( h \) is placed midway between \( f \) and \( 2f \) in front of a biconvex lens. A real inverted image is captured on a screen placed a little beyond \( 2f \) on the other side of the lens. If the whole arrangement is immersed in water without disturbing the object, lens and the screen positions, then the new image formed will be

A beam of incident parallel light falls on a diverging lens of focal length \(20\) cm in magnitude. If a converging lens of focal length \(15\) cm in magnitude is placed at a distance of \(10\) cm to the right of the diverging lens on the other side, then, the final image formed is:

What is the velocity of light in vacuum if the velocity of light in a medium of refractive index 1.2 is \( v \, ms^{-1} \)?

A ray of light is travelling from glass of refractive index \( \frac{3}{2} \) to water of refractive index \( \frac{4}{3} \). What is the minimum angle of incidence for which no light enters into the water?

A beam of light parallel to the principal axis of a concave and convex lens, first passes through the concave lens of focal length \( 0.5 \, \text{m} \) and then through the convex lens of focal length \( 1.75 \, \text{m} \). If the lenses are placed \( 1.25 \, \text{m} \) apart, which of the given statement is true?

When a body of refractive index \( \mu = 1.4 \) is put into a liquid, the body becomes invisible. What would be the refractive index of the medium?