Rankers Physics

Lens Makers Formula/ Len's Formula: Practice Problem & Solution

A beam of light propagating in medium A with index of refraction n (A) passes across an interface into medium B with index of refraction n(B). The angle of incidence is greater than the angle of refraction ; v(A) and v(B) denote the speed of light in A and B. Then which of the following is true :
v(A) > v(B) and n(A) > n(B)
v(A) > v(B) and n(A) < n(B)
v(A) < v(B) and n(A) > n(B)
v(A) < v(B) and n(A) < n(B)

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Similar Practice Questions

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1. Two convex lens each of focal length 20 cm are separated by 125 cm. An object of height 0.5 cm placed at distance 25 cm left side from the first lens then, find height of the final image.
2. Assertion (A): A point object is placed at a distance of \(26 \text{ cm}\) from a convex mirror of focal length \(26 \text{ cm}\). The image will form at infinity. Reason (R): For above given system the equation \(\frac{1}{v} - \frac{1}{u} = \frac{1}{f}\) gives position of image.  
3. Assertion (A): Iris of the eye contains rods and cones which transmits electric signal to brain through optic nerve. Reason (R): Rods sense colour of object and cone sense intensity of light.  
4. As shown in figure, a convergent lens is placed inside a cell filled with liquid. The lens has focal length +20 cm when in air, and its material has refractive index 1.50. If the liguid has refractive index 1.60, the focal length of the system is :
5. Assertion (A): A real object is placed on the optic axis of a lens such that magnification of the image is (+0.5). The lens must then be a divergent lens. Reason (R): A concave lens always produces a virtual image of a real object.