Science Practice Quiz 88

Q1.How are the two principal foci of a lens usually represented?

A. O1 and O2 B. C1 and C2 C. F1 and F2 D. P1 and P2

Q2.What is the distance of the principal focus from the optical centre of a lens called?

A. Radius of curvature B. Aperture C. Focal length D. Principal axis

Q3.According to Activity 9.11, how can the approximate focal length of a convex lens be found?

A. By measuring its diameter B. By calculating its radius of curvature C. By measuring the distance between the lens and the image of the Sun D. By observing the colour of the refracted light

Q4.How do lenses primarily form images?

A. By reflecting light. B. By absorbing light. C. By refracting light. D. By scattering light.

Q5.For a convex lens, if an object is placed at infinity, what is the nature and position of the image formed?

A. Virtual and erect, at 2F2. B. Real and inverted, at focus F2. C. Real and erect, beyond 2F2. D. Virtual and inverted, between F1 and O.

Q6.When an object is placed beyond 2F1 in front of a convex lens, where is the image formed and what is its relative size?

A. At 2F2, same size. B. Between F2 and 2F2, diminished. C. Beyond 2F2, enlarged. D. At focus F1, highly diminished.

Q7.What is the nature and size of the image formed by a convex lens when the object is placed at 2F1?

A. Real and inverted, enlarged. B. Virtual and erect, same size. C. Real and inverted, same size. D. Virtual and inverted, diminished.

Q8.If an object is placed between F1 and 2F1 of a convex lens, what is the position and nature of the image?

A. At focus F2, virtual and erect. B. Beyond 2F2, real and inverted. C. At 2F2, virtual and inverted. D. Between F2 and 2F2, real and erect.

Q9.Where is the image formed by a convex lens when the object is placed at its focus F1?

A. At 2F2. B. Between F2 and 2F2. C. At infinity. D. On the same side as the object.

Q10.For a convex lens, when an object is placed between its focus F1 and optical centre O, what is the nature of the image formed?

A. Real and inverted. B. Real and erect. C. Virtual and inverted. D. Virtual and erect.

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Science Practice Quiz 88