Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
AP EAMCET201921 Apr 2019Morning ShiftPhysicsRay OpticsActual

A girl of height 150 ~cm with her eye level at 140 ~cm stands in front of plane mirror of height 75 ~cm fixed to a wall. The lower edge of the mirror is at a height of 85 ~cm above her feet level. The height of her image the girl can see in the mirror is

Options

  1. A130 cm
  2. B140 cm
  3. C120 cm
  4. D150 cm

Correct answer

C. 120 cm

Step-by-step solution

Ray diagram of a girl standing in front of a plane mirror is given below, Applying the property of triangle and from similar triangles O P M₁ and O I₁ I₂ , = P M₁ O P = I₁ I₂ O I₁ Since, P M₁=140-85=55 ~cm Let gathered O P=a and O I₁=2 a = 55 a = x 2 a x=55 2=110 ~cm gathered So, the maximum height seen by the girl, H=110+10=120 ~cm Since, the height above her eyes, has not effected the mirror height, because it is just in front of the mirror. Hence, the correct option is (c).

Practice Ray Optics on Quantrex Academy →

More from Ray Optics

The critical angle for a typical glass air interface is 42^ . If a ray of light falls normally on one of the faces of the prism of angle 45^ . The emergent ray will: 2026The distance between the objective and eye piece of astronomical telescope in normal adjustment is 27 cm and its magnifying power is 8. What is the focal length of the objective le 2026The ratio of the angle of deviation produced by a thin prism, when it is placed in air to the angle of deviation produced when it is immersed in water of refractive index 4 3 is: 2026An object placed 40 cm in front of a thin convex lens is moved to 60 cm from the lens. If the focal length of the lens is 30 cm the ratio of magnification of the image at the initi 2026A glass slab of 16 cm thickness has its bottom surface silvered. An air bubble is located inside the glass slab at a distance of 8 cm from the top surface. The refractive index of 2026If a clear liquid has a refractive index of 1.45 and a transparent solid has a refractive index of 2.9, then for total internal reflection to occur at the interface between the two 2026An object is placed at an unknown distance from a convex objective lens of focal length 8 cm. The objective lens forms a real image which acts as an object for a convex eyepiece of 2026An object is placed 25 cm in front of a fully silvered concave mirror of focal length 15 cm. A plane mirror is placed 35 cm behind the concave mirror on the side opposite to the ob 2026 Full Ray Optics list All AP EAMCET PYQs