1. . The principal focus of a concave mirror is:
(A) Virtual
(B) Real
(C) Both a and b
(D) None of these
2. . Which type of image is formed by a convex lens on a screen?
(A) Inverted and real
(B) Inverted and virtual
(C) Upright and real
(D) Upright and virtual
3. . Which type of image is produced by the converging lens of human eye if it views a distant object?
(A) Real, erect, same size
(B) Real, inverted, diminished
(C) Virtual, erect, diminished
(D) Virtual, inverted, diminished
4. . An object is placed at the center of curvature of a concave mirror. The image produced by the mirror is located:
(A) Between the center of curvature and the focal length
(B) At the center of curvature
(C) Out beyond the center of curvature
(D) At the focal point
5. . If p = 10, q = 30 cm, then magnification will be:
(A) 3
(B) 5
(C) 10
(D) 30
6. . The formula for focal length is:
(A) f = R/2
(B) f = R/4
(C) f = R/3
(D) f = R/5
7. . The magnification formula for compound microscope is:
(A) M = q/p
(B) M = 1 + q/p
(C) L/f
(D) L/f(1 + d/f)
8. . The relationship between focal length ‘f’ and radius of curvature ‘r’ of a spherical mirror is:
(A) f = 2r
(B) f = r/2
(C) f = 2r²
(D) f = 2f²
9. . If an object is placed at C of the concave mirror, then the image formed will be:
(A) At F
(B) Behind the mirror
(C) At C
(D) In between C and F
10. . If an object is placed within the focal length of a concave mirror then the image formed will be:
(A) Real and erect
(B) Virtual and inverted
(C) Real and behind the mirror
(D) Virtual and behind the mirror
11. . The radius of curvature of a concave mirror is 40 cm, its focal length will be equal to:
(A) 80 cm
(B) 20 cm
(C) 40 cm
(D) 4 cm
12. . The unit for the power of lens is:
(A) Watt
(B) cm
(C) meter
(D) Dioptre
13. . The focal length of a lens is 20 cm; its power in dioptre will be equal to:
(A) 20 D
(B) 0.5 D
(C) 2 D
(D) 5 D
14. . If an object is placed in front of a convex lens in between its F and 2F then the image will be:
(A) Virtual
(B) Erect
(C) Real and inverted
(D) Real and erect