The E.N.T. (Ear, Nose, Throat) doctor uses a:
A. Convex mirror
B. Convex lens
C. Plane mirror
D. Concave mirror

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Hint: E.N.T. doctors are the ear, nose, throat specialist. They have to look in the narrow passage and they have to look for the small and delicate parts of the ear, nose, and throat. So, they need the image formed by the particular mirror which is larger than the object.

Complete step by step answer:
Here if we see the options then the option (B) and (C) are definitely incorrect because option (B) convex “lens” is given which is not applicable for enlarging the images. In option (C) “plane mirror” is given which will give the same size of the image as that of the object, so there is no use of the plane mirror.
Now if we compare the rest of the options, we see that the concave mirror will give a larger image than the object in comparison to the convex mirror.
So, if we put the object at some appropriate distance to the mirror the image obtained will be larger than the object.
For example, if we put the object in between the focus and the mirror the image formed by the concave mirror will be enlarged, virtual and erect.

So, by adjusting the position of the mirror with respect to the parts of the ear, nose, and throat the doctor can see the enlarged image of that part with the concave mirror.

So, the correct answer is “Option D”.

Note: Concave mirror can form both the virtual and real images on the basis of the position of the object relative to the mirror. As we decrease the distance from the mirror the concave mirror will give the real and the magnified images while if we increase the distance of the object from the mirror then the images will start to be real but smaller in size than the object.