Assessment: Applications of Light and Optical Instruments

A camera lens (f=0.06 m) photographs an object 4 m away. Find the image distance, rounded to 4 decimal places.

A myopic person's far point is 5 m. Find the power of the corrective lens needed.

A microscope has L=0.20 m, f₀=0.008 m, and fₑ=0.02 m. Find its magnifying power (D=0.25 m).

A telescope has f₀=1.2 m and fₑ=0.03 m. Find its magnifying power.

A laser emits light at 450 nm (blue). Find the energy of each photon.

An optical fibre has a critical angle of 45°. Find its refractive index n.

A spectrometer analyzing sunlight reveals dark lines at specific missing wavelengths. What are these lines known as, and what do they reveal?

A photographer moves a studio light from 1 m to 2 m away from a subject. By what factor does the illuminance on the subject change?

A camera lens forms a sharp image at v=0.052 m for an object at u=2.6 m. Find the lens's focal length.

A telescope has magnification 60 and an eyepiece focal length of 0.015 m. Find its objective focal length.