Draw ray diagrams showing the image formation by a convex lens when an object is placed:At twice the focal length of the lens.
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The real and inverted image of equal to the size of object forms at focus $2 F_2$ on the other side of the object when the object is placed at twice the focal length of the lens.
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The speed of light in water is $2.25 \times 10^8 m / s$. If the speed of light in vacuum be $3 \times 10^8 m / s$, calculate the refractive index of water.
Draw a ray diagram to show the formation of a real magnified image by a convex lens. (In your sketch the position of object and image with respect to the principal focus of lens should be shown clearly).
An object is placed at a distance of 15 cm from a concave lens of focal length 30 cm. List four characteristics (nature, position, etc.) of the image formed by the lens.