MHT CET 2019 3rd May Morning Shift | Ray Optics Question 113 | Physics

The magnifying power of a telescope is nine. When it is adjusted for parallel rays, the distance between the objective and eyepiece is 20 cm . The focal length of objective and eyepiece are respectively

$10 \mathrm{~cm}, 10 \mathrm{~cm}$

$18 \mathrm{~cm}, 2 \mathrm{~cm}$

$15 \mathrm{~cm}, 5 \mathrm{~cm}$

$11 \mathrm{~cm}, 9 \mathrm{~cm}$

MHT CET 2019 3rd May Morning Shift

MCQ (Single Correct Answer)

-0

The refractive index of the material of crystal is 1.68 and that of castor oil is 1.2. When a ray of light passes from oil to glass, its velocity will change by a factor

$\frac{2}{3}$

$\frac{3}{4}$

$\frac{5}{6}$

$\frac{5}{7}$

MHT CET 2019 2nd May Evening Shift

MCQ (Single Correct Answer)

-0

When light enters glass from vacuum, then the wavelength of light

decreases

becomes zero

remains same

increases

MHT CET 2019 2nd May Evening Shift

MCQ (Single Correct Answer)

-0

A convex lens of focal length ' $f$ ' is placed in contact with a concave lens of the same focal length. The equivalent focal length of the combination is

$f$

infinity

$\frac{f}{2}$

zero

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