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(b) same
(a) 2:3
(c) 1.414
(d) 4
(b) - 7.5 cm
(b) – 7.5 cm
Sun glasses have zero power as the radius of curvature of the two surfaces is
(b) same
(b) same
See lessThe ratio of the wavelengths of a light wave travelling with a speed of 2 x 10⁸ and 3 x 10⁸ in different media is
(a) 2:3
(a) 2:3
See lessIf the critical angle for a medium is 45°, its refractive index will be
(c) 1.414
(c) 1.414
See lesslf four different colours of light fall parallel to the principal axis of a convex lens, the number of points of convergence on the axis will be
(d) 4
(d) 4
See lessAn object is placed at a distance of 30 cm from a concave lens of focal length 10 cm. The position of image from the optical centre is
(b) - 7.5 cm
(b) – 7.5 cm
See less