Ray Optics
Q. 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.
Correct Answer: A — 30 degrees
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Q. 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.
Correct Answer: A — 30 degrees
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Q. 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.
Correct Answer: C — Can be real or virtual
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