Ray Optics Mock Tests

Convex lens f in contact with concave lens 2f. Combined focal length:

A convex lens of focal length f is dipped in a liquid of refractive index equal to that of the lens material. The focal length of the lens will become

A concave mirror has a focal length of 20 cm. An object is placed at 30 cm from the mirror. The image distance is:

The focal lengths of the objective and eyepiece of a compound microscope are 0.5 cm and 2.5 cm respectively. The distance between the two lenses is 7 cm. If the final image is formed at infinity, the magnifying power of the microscope is: (Least distance of distinct vision = 25 cm)

Convex lens f = 20 cm in contact with concave lens f = 10 cm. Power of combination:

A prism has refracting angle A = 60° and refractive index μ = √2. The angle of minimum deviation is:

A convex mirror has focal length f. An object is placed at distance u from it. The image distance v is given by:

A compound microscope has an objective of focal length 2 cm and an eyepiece of focal length 5 cm. The object is placed 2.5 cm from the objective and the final image is formed at infinity. The magnifying power of the microscope (least distance of distinct vision = 25 cm) is: