Optics and Light Properties

It is correct. Reflection is the bouncing back of light when it strikes a smooth surface, like a mirror.

Rhodopsin, also known as visual purple, is a biological pigment in photoreceptor cells of the retina that is responsible for the first events in the perception of light. Rod cells detect the degree of lightness entering the eye, and their sensitivity is dependent on the amount of rhodopsin present. This pigment is sensitive to red light in the retinal rods of the eyes consisting of opsin and retinene.

First law: The incident ray, the normal to the surface at the point of incidence and the reflected ray, all lie in the same plane.

The perpendicular distance between the direction of the incident ray and the emergent ray is called “lateral shift’’.

Speed of light in glass = Speed of light in vacuum/refractive index of glass
= 3 × 10⁸/1.20 = 2.5 x 10⁸ m/s

By using formula of deviation, we get   (360 - 2q) = (360 – 40 x 2) = 280^o

An optical fiber is a very thin fiber made of glass that functions as a waveguide for light. It transmits signals in the form of light i.e. the visible part of the spectrum.

A beam of light does not scatter when it is passed through a true solution because the size of particles is less than 10^–9 m.

This answer is correct as interference due to self absorption occurs due to the absorption of radiant energy through collision with atoms of its own kind present in ground energy level, which primarily depends upon the number of atoms present in ground state. The concentration of atomized solution and by the probability that these atoms will be excited by the incident radiation from excited atoms of its own kind.

This answer is correct as the given statement is false since Beer-Lambert law is true only for light of single wavelength or monochromatic light since molar absorptivity is a function of wavelength.

This component of Dense Wavelength Division Multiplexing(DWDM) compensates the loss in optical power while the signal travels along the fibre.

The objects through which light cannot pass are known as opaque objects. Thus, cardboard is opaque as light cannot pass through it. 

Opaque objects form dark shadows as transparent and translucent objects allow light to pass through them.

Non-luminous objects are those which shine by reflecting the light of the luminous objects. They do not emit their own light, e.g. moon.

A shadow is always formed by an opaque object. The shape of a shadow depends upon two factors:

1. Size of the source of light
2. Position of the source of light. Smaller the size of the light source, larger will be the image formed and greater is the distance between the object and the light source, lighter will be the image formed.