Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
BITSAT2024PhysicsRay OpticsActual

If the distance between object and its two times magnified virtual image produced by a curved mirror is 15 cm , the focal length of the mirror must be:

Options

  1. A10 3 ~cm
  2. B-12 ~cm
  3. C-10 ~cm
  4. D15 cm

Correct answer

C. -10 ~cm

Step-by-step solution

Since, image is magnified. So, it is a concave mirror. m =2= - v u 2= -(15-u) -u 2 u=15-u3 u =15 u =5 ~cm v =15- u =15-5=10 ~cm Bymirror formula, 1 f = 1 v + 1 u = 1 10 + 1 (-5) = 1-2 10 = -1 10 f =-10 ~cm

Practice Ray Optics on Quantrex Academy →

More from Ray Optics

Power of biconvex lens is P diopter. When it is cut into two symmetrical halves by a plane containing the principal axis. The ratio of power of two halves is 2024The magnifying power of a telescope is 9 . When it is adjusted for parallel rays, the distance between the objective and eyepiece is 20 cm . The ratio of focal length of objective 2024In normal adjustment, for a refracting telescope, the distance between objective and eye piece is 30 cm . The focal length of the objective, when the angular magnification of the t 2024A thin prism P₁ with an angle 6^ and made of glass of refractive index 1.54 is combined with another prism P ₂ made from glass of refractive index 1.72 to produce dispersion withou 2023In a reflecting telescope, a secondary mirror is used to: 2023A mosquito O is sitting infront of a glass rod having spherical end of radius of curvature 40 ~cm . The image would be formed at 2022An achromatic convergent doublet of two lense in contact has a power of +5 D . The power of converging lens is +6 D . The ratio of the dispersive power of the convergent and diverg 2022Green light of wavelength 5460 Å is incident on an airglass interface. If the refractive index of glass is 1.5 , the wavelength of light in glass would be ( c =3 10⁸ ~ms ⁻¹ ) 2021 Full Ray Optics list All BITSAT PYQs