(C) The rectilinear propagation of light is a valid approximation in the field of ray optics. This approximation holds true when the size of the obsta

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When the size of the obstacle or aperture is very large compared to the wavelength of light.

(C) The rectilinear propagation of light is a valid approximation in the field of ray optics. This approximation holds true when the size of the obstacles or apertures $(a)$ encountered by the light is much larger than the wavelength of the light $(\lambda)$. Mathematically, this condition is expressed as $a \gg \lambda$. Under this condition, the effects of diffraction are negligible, and light appears to travel in straight lines.

Class 12 Physics Ray Optics and Optical Instruments Refraction of Light

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When can it be assumed that light moves in a straight line?

A
When the wavelength of light is very large.
B
When the size of the obstacle or aperture is very small compared to the wavelength of light.
C
When the size of the obstacle or aperture is very large compared to the wavelength of light.
D
When the light source is at an infinite distance.

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Ray Optics and Optical Instruments

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Refraction of Light

$A$ ray of light is incident on a transparent sphere at an angle of $\pi / 4$ and is refracted at an angle $r$. The ray emerges from the sphere after suffering one internal reflection. The total angle of deviation of the ray is

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$A$ red colour in air has a wavelength of $760 \,nm$. When light passes through water of refractive index $n = \frac{4}{3}$,its wavelength becomes $570 \,nm$. (The wavelength of yellow colour in air is $570 \,nm$). The colour of the red light in water is:

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Monochromatic light of wavelength $589 \; nm$ is incident from air on a water surface. What are the wavelength,frequency,and speed of
$(a)$ reflected,and
$(b)$ refracted light? Refractive index of water is $1.33$.

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$A$ ray of light is incident at the glass-water interface at an angle $i$. It emerges finally parallel to the surface of water. If the refractive index of water is $\mu_w = 4/3$,then the value of the refractive index of glass $\mu_g$ is:

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$A$ wave has velocity $u$ in medium $P$ and velocity $2u$ in medium $Q.$ If the wave is incident in medium $P$ at an angle of $30^\circ,$ then the angle of refraction will be .... $^o$

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When can it be assumed that light moves in a straight line?

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$A$ ray of light is incident on a transparent sphere at an angle of $\pi / 4$ and is refracted at an angle $r$. The ray emerges from the sphere after suffering one internal reflection. The total angle of deviation of the ray is

$A$ red colour in air has a wavelength of $760 \,nm$. When light passes through water of refractive index $n = \frac{4}{3}$,its wavelength becomes $570 \,nm$. (The wavelength of yellow colour in air is $570 \,nm$). The colour of the red light in water is:

Monochromatic light of wavelength $589 \; nm$ is incident from air on a water surface. What are the wavelength,frequency,and speed of$(a)$ reflected,and$(b)$ refracted light? Refractive index of water is $1.33$.

$A$ ray of light is incident at the glass-water interface at an angle $i$. It emerges finally parallel to the surface of water. If the refractive index of water is $\mu_w = 4/3$,then the value of the refractive index of glass $\mu_g$ is:

$A$ wave has velocity $u$ in medium $P$ and velocity $2u$ in medium $Q.$ If the wave is incident in medium $P$ at an angle of $30^\circ,$ then the angle of refraction will be .... $^o$

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Monochromatic light of wavelength $589 \; nm$ is incident from air on a water surface. What are the wavelength,frequency,and speed of
$(a)$ reflected,and
$(b)$ refracted light? Refractive index of water is $1.33$.