1. A concave mirror forms an  Concave lensConvex lenserectinverted imageLensmagnifying glassrainbowreal imageseven coloursspherical lensesvirtual and  Concave lensConvex lenserectinverted imageLensmagnifying glassrainbowreal imageseven coloursspherical lensesvirtual.
2. Image formed by an convex mirror is  Concave lensConvex lenserectinverted imageLensmagnifying glassrainbowreal imageseven coloursspherical lensesvirtual and  Concave lensConvex lenserectinverted imageLensmagnifying glassrainbowreal imageseven coloursspherical lensesvirtual
3.  Concave lensConvex lenserectinverted imageLensmagnifying glassrainbowreal imageseven coloursspherical lensesvirtual is a piece of' refracting transparent medium bounded by two surfaces in which at least one has curved surface.
4. The commonly used lenses are the  Concave lensConvex lenserectinverted imageLensmagnifying glassrainbowreal imageseven coloursspherical lensesvirtual
5. A convex lens can form  Concave lensConvex lenserectinverted imageLensmagnifying glassrainbowreal imageseven coloursspherical lensesvirtual and  Concave lensConvex lenserectinverted imageLensmagnifying glassrainbowreal imageseven coloursspherical lensesvirtual.
6.  Concave lensConvex lenserectinverted imageLensmagnifying glassrainbowreal imageseven coloursspherical lensesvirtual is thicker in the middle and thinner at tho edges.
7.  Concave lensConvex lenserectinverted imageLensmagnifying glassrainbowreal imageseven coloursspherical lensesvirtual is thicker at the edges and thinner at the middle.
8. When a convex lens is used to see objects magnified, it is called  Concave lensConvex lenserectinverted imageLensmagnifying glassrainbowreal imageseven coloursspherical lensesvirtual
9. White light is composed of  Concave lensConvex lenserectinverted imageLensmagnifying glassrainbowreal imageseven coloursspherical lensesvirtual if it passes through prism
10. An arc of seven colours seen in the sky is known as  Concave lensConvex lenserectinverted imageLensmagnifying glassrainbowreal imageseven coloursspherical lensesvirtual.