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[" a) "(sqrt(3))/(sqrt(2))@quad " b) "(sqrt(2))/(sqrt(3))quad " c) "(1)/(sqrt(2))quad " d) "sqrt(2)],[" Rays from Sun converge at a point "15cm" in front to a concave mirror.Where "],[" should an object be placed so that size of its image is equal to the size of the "],[" chect? "]

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Rays from Sun converge at a point 15 cm in front of a concave mirror. Where should an object be placed so that size of its image is equal to the size of the object ?

Rays from Sun converge at a point 15 cm in front of a concave mirror. Where should an object be placed so that size of its image is equal to the size of the object ?

If a=(sqrt(3))/(2), then sqrt(1+a)+sqrt(1-a)=?(2-sqrt(3))(b)(2+sqrt(3))(c)((sqrt(3))/(2))(d)sqrt(3)

1/(sqrt(9)-\ sqrt(8)) is equal to: (a) 3+2sqrt(2) (b) 1/(3+2sqrt(2)) (c) 3-2sqrt(2) (d) 3/2-\ sqrt(2)

Find two positions of an object, placed in front of a concave mirror of focal length 15cm, so that the image formed is 3 times the size of the object.

(1)/(sqrt(9)-sqrt(8)) is equal to: 3+2sqrt(2)(b)(1)/(3+2sqrt(2)) (c) 3-2sqrt(2)(d)(3)/(2)-sqrt(2)