Q.A car uses a convex mirror of curvature 1.2 m as its rear-view mirror. A minibus of cross section 2.4 m × 2.4 m is 6.6 m away from the mirror. Estimate the image size.

[!TLDR] For a convex mirror (f=+60 cm) with the minibus 660 cm away, the mirror formula gives v=55 cm and m=1/12, so the 2.4 m square minibu …

R=1.2 m=120 cm, so f=R/2=+60 cm (convex mirror, positive by the sign convention). Object distance u=-6.6 m=-660 cm. Using 1/f=1/v+1/u: 1/60=1/v+1/(-660), so 1/v=1/60+1/660=(11+1)/660=12/660=1/55, giving v=+55 cm. Magnification m=-v/u=-55/(-660)=1/12. Since the minibus's cross-section is a 2.4 m x 2.4 m square, the image size in each dimension is 2.4 x (1/12) = 0.2 m, so the image is a …

Compute f=+60 cm for the convex mirror, apply the mirror formula with u=-660 cm to find v, take the magnification m=-v/u, and ap …

Using a negative focal length for the convex mirror (that sign belongs to concave mirrors only), which …