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Ray Optics Class 12 mcq. We covered all the Ray Optics Class 12 mcq in this post for free so that you can practice well for the exam.
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mcq on Ray Optics for NEET Students
In an equilateral prism with a refractive index of 1.414, what is the angle of minimum deviation?
(a) 30°
(b) 45°
(c) 60°
(d) 90°
Option a – 30°
To increase the combined power of two 2.5 D lenses to 3.75 D, which lens should be added?
(a) Convex lens with 80 cm focal length
(b) Concave lens with 80 cm focal length
(c) Convex lens with 20 cm focal length
(d) Concave lens with 45 cm focal length
Option b – Concave lens with 80 cm focal length
The focal length of a lens does not depend on which of the following?
(a) Refractive index of the material
(b) Radii of curvature
(c) Distance of the object
(d) None of the above
Option c – Distance of the object
Assertion: Anastigmatic lenses are commonly used in devices like cameras and telescopes.
Reason: These lenses eliminate most of the common optical defects.
(a) Both Assertion and Reason are true, and Reason explains Assertion
(b) Both are true, but Reason is not the correct explanation
(c) Assertion is true, Reason is false
(d) Assertion is false, Reason is true
Option a – Both Assertion and Reason are true, and Reason explains Assertion
A Light ray passes through a prism where the angle of incidence and emergence are equal, and both are ¾ of the prism’s angle. The angle of deviation is
(a) 45°
(b) 39°
(c) 20°
(d) 30°
Option d – 30°
Two thin lenses in contact have a total power of +10 D. When they are separated by 0.25 m, the power drops to +6 D. What are the individual focal lengths?
(a) f₁ = 0.1 m, f₂ = 0.5 m
(b) f₁ = 0.125 m, f₂ = 0.2 m
(c) f₁ = 0.125 m, f₂ = 0.5 m
(d) f₁ = 0.1 m, f₂ = 0.2 m
Option c – f₁ = 0.125 m, f₂ = 0.5 m
Reema cannot clearly see objects closer than 1.5 m. What lens power should she use to read a book at 30 cm?
(a) +3.0 D
(b) +0.125 D
(c) -3.0 D
(d) +2.67 D
Option d – +2.67 D
Which of the following materials will show dispersion of Light?
(a) Solid rectangular glass block
(b) Prism made of ice
(c) Hollow rectangular glass slab
(d) Hollow glass prism
Option b – Prism made of ice
A square card of side 1 mm is viewed through a magnifier of 10 cm focal length, placed 6 cm away. The visible area is approximately
(a) 4 mm²
(b) 6.25 mm²
(c) 27 mm²
(d) 16 mm²
Option b – 6.25 mm²
A ray hits a prism at 60° on one face, and the emerging ray forms a 30° angle with it. If the prism angle is 30°, the refractive index is
(a) 1.732
(b) 1.5
(c) 1.414
(d) 1.33
Option a – 1.732
When will dispersion not occur?
(a) All materials have a refractive index of 1
(b) All wavelengths travel at the same speed
(c) Both (a) and (b)
(d) Neither (a) nor (b)
Option c – Both (a) and (b)
Yellow Light refracts at 90° at a specific angle of incidence. If replaced with other colors under the same conditions, which is correct?
(a) Red Light undergoes total internal reflection
(b) Red Light bends towards the normal
(c) Green Light undergoes total internal reflection
(d) Green Light bends away from the normal
Option c – Green Light undergoes total internal reflection
White Light passes through a convex lens. If blue, yellow, and red Light focus at 10 cm, 10.5 cm, and 11.4 cm, the dispersive power is approximately
(a) 0.0671
(b) 0.0846
(c) 0.129
(d) 0.169
Option c – 0.129
A telescope has an objective lens of 200 cm focal length and an eyepiece of 4 cm. The angular size of the moon appears as
(a) 100°
(b) 50°
(c) 25°
(d) 30°
Option d – 30°
Two lenses of powers -2 D and +4 D are aligned together. What is their combined focal length?
(a) 50 cm
(b) 62.7 cm
(c) 75 cm
(d) 82.9 cm
Option a – 50 cm
In the position of minimum deviation, the refracted ray inside the prism makes what angle with the Base?
(a) 0°
(b) 30°
(c) Equal to the prism angle
(d) 45°
Option a – 0°
Snell’s law applies when the incident angle is
(a) More than the critical angle
(b) Less than the critical angle
(c) Less than or equal to the critical angle
(d) Greater than or equal to the critical angle
Option c – Less than or equal to the critical angle
A concave lens forms an image such that the object-image distance is 15 cm and the magnification is 1/6. What is the focal length?
(a) -6.2 cm
(b) -4 cm
(c) -8.6 cm
(d) -10 cm
Option b – -4 cm
Why are images from total internal reflection extremely bright?
(a) They are virtual with unit magnification
(b) They are real with unit magnification
(c) All light is reflected within the medium
(d) Light passes into a denser medium
Option c – All light is reflected within the medium
During the formation of a rainbow, how many times does sunlight undergo refraction and reflection in a water droplet?
(a) 1 refraction, 1 reflection
(b) 2 refractions, 2 reflections
(c) 2 refractions, 1 reflection
(d) 1 refraction, 2 reflections
Option c – 2 refractions, 1 reflection
Identify the incorrect statement about a two-lens system in contact.
(a) Enhances magnification
(b) Reduces the field of view
(c) Converts inverted image into erect
(d) Improves sharpness of image
Option b – Reduces the field of view
A lens bends rays parallel to the axis, but they emerge laterally displaced. Which type is it?
(a) Biconcave
(b) Biconvex
(c) Thin lens
(d) Thick lens
Option d – Thick lens
The image on the retina forms due to light passing through how many refractive index layers?
(a) 2
(b) 3
(c) 4
(d) 5
Option d – 5
A convex lens of 30 cm focal length forms an image 2 cm in size from an object at infinity. If a concave lens of 16 cm focal length is placed 24 cm from the convex lens, the new image size is
(a) 1.25 cm
(b) 2.5 cm
(c) 2 cm
(d) 3.2 cm
Option d – 3.2 cm
A thin glass lens with a refractive index of 1.5 has a power of -10 D in air. In a medium with a refractive index of 1.6, its power becomes
(a) 1.25 D
(b) -1.25 D
(c) 10 D
(d) -25 D
Option a – 1.25 D
A biconvex lens and a concavo-convex lens made of glass (n = 1.5) have focal lengths of 24 cm and -120 cm. What are the respective radii of curvature?
(a) 10 cm and 20 cm
(b) 20 cm and 10 cm
(c) 20 cm and 30 cm
(d) 30 cm and 20 cm
Option c – 20 cm and 30 cm
Why is the secondary rainbow less intense than the primary one?
(a) It forms after the primary reflection
(b) It appears when the sun is low
(c) Light undergoes two reflections causing more absorption
(d) All of the above
Option c – Light undergoes two reflections causing more absorption
If a telescope has an objective of 158 cm and an eyepiece of 4 cm, what is its total length in normal adjustment?
(a) 154 cm
(b) 162 cm
(c) 77 cm
(d) 81 cm
Option b – 162 cm
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