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Q1. A ray of light passes from air into glass at an angle of 45 degrees. What is the angle of refraction if the refractive index of glass is 1.5? (2022)
A
. 30 degrees
B
. 45 degrees
C
. 60 degrees
D
. 90 degrees
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Solution:
Using Snell's law, n1 * sin(theta1) = n2 * sin(theta2). Here, n1 = 1 (air), theta1 = 45 degrees, n2 = 1.5 (glass). Thus, sin(theta2) = (1 * sin(45))/1.5 = 0.471, giving theta2 ≈ 30 degrees.
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Q2. A light ray strikes a plane mirror at an angle of incidence of 30 degrees. What is the angle of reflection? (2021)
A
. 30 degrees
B
. 60 degrees
C
. 90 degrees
D
. 45 degrees
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Solution:
According to the law of reflection, the angle of reflection is equal to the angle of incidence. Therefore, the angle of reflection is also 30 degrees.
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Q3. Which of the following statements is true about the image formed by a convex lens? (2021)
A
. Always real
B
. Always virtual
C
. Can be real or virtual
D
. Always inverted
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Solution:
A convex lens can form both real and virtual images depending on the position of the object relative to the focal point.
