Question

42. Two spherical mirrors are 20 mm apart. An object, 3 mm high, is 15 mm in front of one mirror. This mirror is concave and has 20 mm radius of curvature. After reflection the rays strike the other mirror. It is convex and has a radius of curvature of 40 mm. Find the image distance and size after reflection by both mirrors. Construct image point Q2 Ans.: the inverted image is 20 mm to the right of the second mirror and 12 mm high.

Answer 1

Image formation by concave mint mirror fak = + 20mm = +10 mm do = + 15mm ho = + 3 mm / = 1 + 2 Tomm = 15mm + L + di = + 30 mm mognification, m he = - 6mm that is inverted image, real a size 6mm

Final image formation by convex mirror image formed by concave minor will act as object for conver mirror, distance between mirrors is 20mm hence object distance for convex mirror will be do =-(30mm-20 mm) = -18mm (- since virtual f = { = - Uomm = -20 mm di = +20 mm = hi= -12 mm Hence final image is 20mm front of convex mirror that is to the right of convex mirror. size of final image is 12mm Image is real 4 inverted with respect to object IN