Rewrite the following statements by selecting the correct options:i.

1.	Rewrite the following statements by selecting the correct options:i. Inside water, an air bubble behaves……….. (a) like a flat plate (b) like a concave lens (c) like a convex lens (d) like a concave mirrorii. …………represents the lens formula.(a) \(\frac{1}{v}+\frac{1}{u}=\frac{1}{f}\)(b) \(\frac{1}{v}-\frac{1}{u}=\frac{1}{f}\)(c) \(\frac{1}{v}+\frac{1}{u}=\frac{2}{f}\)(d) \(\frac{1}{u}-\frac{1}{v}=\frac{1}{f}\)iii. The power of a convex lens of focal length 25 cm is……….. (a) +4.0 D (b) 0.25 D (c) -4.0 D (d) -0.4Div. A lens does not produce any deviation of a ray of light passing through………..(a) it’s centre of curvature(b) it’s optical centre (c) it’s principal focus (d) an axial point at a distance 2F from its centrev. The image formed by a concave lens is always……….. (a) virtual and erect (b) real and erect (c) virtual and inverted (d) real and inverted
Answer» i. Inside water, an air bubble behaves like a concave lens. ii. (b) \(\frac{1}{v}-\frac{1}{u}=\frac{1}{f}\) represents the lens formula. iii. The power of a convex lens of focal length 25 cm is +4.0 D iv. A lens does not produce any deviation of a ray of light passing through its optical centre. v. The image formed by a concave lens is always virtual and erect.

Rewrite the following statements by selecting the correct options:i. Inside water, an air bubble behaves……….. (a) like a flat plate (b) like a concave lens (c) like a convex lens (d) like a concave mirrorii. …………represents the lens formula.(a) \(\frac{1}{v}+\frac{1}{u}=\frac{1}{f}\)(b) \(\frac{1}{v}-\frac{1}{u}=\frac{1}{f}\)(c) \(\frac{1}{v}+\frac{1}{u}=\frac{2}{f}\)(d) \(\frac{1}{u}-\frac{1}{v}=\frac{1}{f}\)iii. The power of a convex lens of focal length 25 cm is……….. (a) +4.0 D (b) 0.25 D (c) -4.0 D (d) -0.4Div. A lens does not produce any deviation of a ray of light passing through………..(a) it’s centre of curvature(b) it’s optical centre (c) it’s principal focus (d) an axial point at a distance 2F from its centrev. The image formed by a concave lens is always……….. (a) virtual and erect (b) real and erect (c) virtual and inverted (d) real and inverted

Answer»

i. Inside water, an air bubble behaves like a concave lens.

ii. (b) \(\frac{1}{v}-\frac{1}{u}=\frac{1}{f}\) represents the lens formula.

iii. The power of a convex lens of focal length 25 cm is +4.0 D

iv. A lens does not produce any deviation of a ray of light passing through its optical centre.

v. The image formed by a concave lens is always virtual and erect.