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91. System is shown in the figure. Light rays from a paint object are first deviated by a prism and then focused by a thin lens of focal length f. The prism is made of material with refractive index and has small apex angle 2^{0} i.e., small angle approximations are valid sinα ≡ α and sin (α + β) = α + β, where α and β are angles. The final image is (NTSE Andhra Pradesh, Stage-I, 2016-17)

Virtual and formed at a distance 2f from the lens

Real and formed at a distance 2f from the lens

Real and formed at a distance f

Real and formed at a distance 3f from the lens

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92. A narrow beam of light is incident on a 30^{0} - 60^{0} - 90^{0} prism perpendicular to the surface AB. Assume that light beam is close to A. The index of refraction of prism is 2.1. See figure and take sin^{-1}() = 28^{0} 26'. The beam emerges from the face (NTSE Andhra Pradesh, Stage-I, 2016-17)

CB

AB

AC

Some light through AC and remaining light through AB

93. Light rays from a very small object immersed in water falls on the bubble of radius R. Assume that the object is very close to the surface of the bubble. Refractive index of water is . Take the approximation sinθ ≡ θ and casθ ≡ 1 where θ is angle and consider the rays close to a diameter of the bubble. Use the following formula to solve the problem (see figure) The image is ........ (from the center of the bubble) (NTSE Andhra Pradesh, Stage-I, 2016-17)

Virtual and formed at a distanceR

Virtual and formed at a distance R

Real and formed at a distance R

94. Light rays from a very small object immersed in water falls on the bubble of radius R. Assume that the object is very close to the surface of the bubble. Refractive index of water is Take the approximation sinθ ≡ θ and cosθ ≡ 1 where θ is angle and consider the rays close to a diameter of the bubble. Use the following formula to solve the problem (see figure) The image is ........ (from the center of the bubble) (NTSE Andhra Pradesh, Stage-I, 2016-17)

95. Object placed ______ of lens or mirror give maximum magnification (NTSE Maharashtra, Stage-I, 2016-17)

At focus

At infinite distance

Between F_{1} and 2F_{1}

At 2F_{1}

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