Ray Optics Mock Tests

A convex lens of focal length f is made of glass (μ_g = 1.5). Immersed in water (μ_w = 1.33), its focal length will:

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:

A convex lens of focal length 20 cm and a concave lens of focal length 10 cm are placed in contact. The power of the combination is:

A ray of light passes from air into a medium with refractive index 1.5. The angle of incidence is 30°. The angle of refraction is approximately:

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

A concave mirror forms a real image that is twice the size of the object. If the focal length is 20 cm, the object 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)

A ray of light incident on a glass prism of refractive index 1.5 undergoes minimum deviation of 30 degrees. The angle of the prism is