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#13 | Image Formed by Lens

(Physics) > Ray Optics and Optical Instruments

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Related Practice Questions :

A concave lens of focal length 25 cm produces image $\frac{1}{10}th$ the size of the object. The distance of the object from the lens is

(1) 225 cm

(2) 250 cm

(3) 150 cm

(4) 175 cm

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A converging beam of light is incident on a concave lens of focal length 30cm, in such a way that their point of intersection would lie at a height 1cm above the principal axis and at a distance of 24cm from the position of the lens if there was no lens. Find the nature of the image formed when the beam passes through the lens.

1. Real at a distance 60cm from the lens

2. Real at a distance 120cm from the lens

3. Virtual at a distance 60cm from the lens

4. Virtual at a distance 120 cm from the lens

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The focal length of a convex lens is f. An object is placed at a distance x from the focal point and a real image is formed. The linear magnification has a magnitude

1. $\frac{{\mathrm{f}}^{2}}{{\mathrm{x}}^{2}}$

2. $\frac{{x}^{2}}{{f}^{2}}$

3. $\frac{f}{x}$

4. $\frac{x}{f}$

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A thin equiconvex lens of power P is cut into three parts A, B, and C as shown in the figure. If ${\mathrm{P}}_{1},{\mathrm{P}}_{2},\mathrm{and}{\mathrm{P}}_{3}$ are powers of the three parts respectively, then

1. ${\mathrm{P}}_{1}={\mathrm{P}}_{2}={\mathrm{P}}_{3}$

2. ${\mathrm{P}}_{1}{\mathrm{P}}_{2}={\mathrm{P}}_{3}$

3. ${\mathrm{P}}_{1}{\mathrm{P}}_{2}={\mathrm{P}}_{3}$

4. ${\mathrm{P}}_{2}={\mathrm{P}}_{3}=2{\mathrm{P}}_{1}$

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The slab of a material of refractive index 2 shown in figure has curved surface *APB* of radius of curvature 10 *cm* and a plane surface *CD*. On the left of *APB* is air and on the right of *CD* is water with refractive indices as given in figure. An object *O* is placed at a distance of 15 *cm* from pole *P* as shown. The distance of the final image of *O* from *P*, as viewed from the left is

(a) 20 *cm*

(b) 30 *cm*

(c) 40 *cm*

(d) 50 *cm*

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