Ten questions. The result tells you which lessons you may skip.
Light travels from left to right. A glass surface is hollow towards the incoming light. On the Cartesian convention, its radius of curvature is
A glass rod (\(\mu = 1.5\)) has a convex end of radius \(10\,\text{cm}\). An object in air is \(30\,\text{cm}\) from the pole. The image is
For light going from air into glass (\(\mu = 1.5\)) through a convex face of radius \(10\,\text{cm}\), the two focal lengths are
A parallel beam falls on a solid glass sphere (\(\mu = 1.5\)) of radius \(10\,\text{cm}\). It comes to a focus
A small fish is at the centre of a round bowl of water (\(\mu = \tfrac43\)). Ignoring the glass, it appears
An equiconvex glass lens (\(\mu = 1.5\)) with radii of \(20\,\text{cm}\) has a focal length of \(20\,\text{cm}\) in air. In water (\(\mu = \tfrac43\)) its focal length is
An object stands \(10\,\text{cm}\) from a convex lens of focal length \(20\,\text{cm}\). The image is
A convex lens of \(20\,\text{cm}\) and a concave lens of \(30\,\text{cm}\) are placed in contact. The power of the pair is
A plano-convex lens of focal length \(20\,\text{cm}\) is silvered on its flat face. It behaves as
An object and a screen are \(100\,\text{cm}\) apart. A convex lens gives sharp images at two positions \(40\,\text{cm}\) apart. The focal length is