CBSE Class 12 · 2024 · Geometrical OpticsMultiple Choice

WhatsApp Email

Three beams of red, yellow and violet colours are passed through a prism, one by one, under the same condition. When the prism is in the position of minimum deviation, the angles of refraction from the second surface are

r_{R}, r_{Y}

and

r_{V}

respectively. Then:

(A) $r_{V} < r_{Y} < r_{R}$
(B) $r_{V} < r_{R} < r_{Y}$
(C) $r_{R} < r_{Y} < r_{V}$ ✓ Correct
(D) $r_{R} < r_{Y} = r_{V}$

Answer: (C)

Solution

μ

increases from red to violet, the deviation increases and (per the CBSE marking key for this item) the emergent angle of refraction from the second surface increases in the order

r_{R} < r_{Y} < r_{V}

CBSE Class 12 Board · 2024 · Single correct option

Practise more: all CBSE board PYQs on Geometrical Optics →

More board questions on Geometrical Optics

The focal lengths of the objective and the eyepiece of a compound microscope are $1 cm$ and $2 cm$ respectively. If the tube length of the microscope is $10 cm$ , the magnification obtained by the microscope for most suitable viewing by a relaxed eye …
CBSE 2024View solution →
The radius of curvature of a convex mirror is $30 cm$ . It forms an image of an object which is half the size of the object. Find the separation between the object and the image.
CBSE 2024View solution →
\textbf{Case study (prism and total internal reflection):} A ray of light suffers successive refractions on passing through the two faces of a prism; $μ = \frac{sin ( \frac{A + δ _{m}}{2} )}{sin \frac{A}{2}}$ . If the angle of incidence on the second surface exceeds th …
CBSE 2024View solution →
When a ray of light of wavelength $λ$ and frequency $ν$ is refracted into a denser medium:
CBSE 2024View solution →
The critical angle for a ray of light passing from glass to water is minimum for:
CBSE 2024View solution →
A ray of light is incident normally on a prism $A B C$ of refractive index $2$ , as shown in the figure. After it strikes face $A C$ , it will:
CBSE 2024View solution →