MHT CET 2025 21st April Evening Shift | Ray Optics Question 11 | Physics

A plano convex lens fits exactly in to a plano concave lens. Their plane surfaces are parallel to each other. Lenses are made up of different materials of refractive indices ' $\mathrm{n}_1$ ' ' $\mathrm{n}_2$ ' and ' R ' is the radius of curvature of the curved surface of lenses. Focal length of the combination is

$\frac{\mathrm{R}}{\mathrm{n}_1+\mathrm{n}_2}$

$\frac{2 R}{n_1-n_2}$

$\frac{R}{2\left(n_1-n_2\right)}$

$\frac{R}{n_1-n_2}$

MHT CET 2025 21st April Morning Shift

MCQ (Single Correct Answer)

-0

The phenomenon, which is not due to total internal reflection is

mirage on hot summer days.

brilliance of diamond

difference between apparent real depth of a pond

working of optical fibre.

MHT CET 2025 20th April Evening Shift

MCQ (Single Correct Answer)

-0

An achromatic convergent doublet of two lenses in contact has a power +2 D . The convex lens has power +5 D . The ratio of the dispersive powers of the convergent and divergent lenses is (in magnitude)

$3: 5$

$2: 5$

$4: 5$

$5: 6$

MHT CET 2025 20th April Morning Shift

MCQ (Single Correct Answer)

-0

The length of the compound microscope is 15 cm . The magnifying power for relaxed eye is 25 . If the focal length of eye lens is 6 cm then the object distance for objective lens will be

1.3 cm

1.5 cm

1.7 cm

1.9 cm

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