What would you use to obtain a virtual and erect image?
A) A concave mirror or a concave lens
B) A convex mirror or a convex lens
C) A concave mirror or a convex lens
D) A convex mirror or a concave lens

Hint: To solve this problem one must be aware of the phenomenon of reflection and refraction. There is also a difference between a mirror and a lens. A mirror is governed by the law of reflection whereas a lens is governed by the law of refraction. A mirror has just one surface that reflects the light whereas a lens has two surfaces either of which can refract the light.

Complete answer:
We know that there are three types of mirrors that are most commonly used.
Plane Mirror: The images that are formed on a plane mirror are of their normal proportions but are reversed from left to right.
Concave Mirror: This is a spherical mirror which is curved inward and the nature of the image depends on the placement of the object.
Convex Mirror: This is a spherical mirror which is curved outward and the images obtained are virtual, diminished and erect.
We also know that there are two types of lenses one is convex while the other one is concave. A concave lens is a diverging lens. A concave lens is thinner at the centre and thicker at the edges. The images that are formed on a concave lens are erect, virtual and diminished.
Hence, we can obtain virtual and erect images by using either a convex mirror or a concave lens.

Therefore, option D is the correct answer.

Note:
Law of reflection: It states that the angle of incidence is equal to the angle of reflection when measured with a side that is normal to the reflecting surface.
Law of refraction: It states that the incident ray, the refracted ray and the normal to the medium all of them lie in one and the same plane.