Plz tell fast - Science - Light

Question

Plz tell fast

Deepika Sharma · Accepted Answer

Dear Student The ray diagrams for all the six cases of concave mirrors u are as follows: I When the object is at infinity The light rays coming from infinity are parallel When parallel light rays are incident on the reflecting surface of a concave mirror, they tend to meet at its focus after reflection In this case, the image is formed at the focus, and is point-sized

II When the object is behind the centre of curvature

In this case, the image is formed between the focus (F) and the centre of curvature (C) This image is real, inverted and diminished III When the object is at the centre of curvature In this case, the image is formed at the centre of curvature This image is real, inverted and of the same size as the object

IV When the object is between the centre of curvature (C) and the focus (F)

In this case, the image is formed behind the centre of curvature This image is real, inverted and magnified V When the object is at the focus (F) In this case, the image is formed at infinity This image is real, inverted and highly enlarged

VI When the object is placed between the focus (F) and the pole (P)

In this case, the image is formed behind the mirror This image is virtual, erect and magnified The discussion is summarised in the table given below Object position Image position Size of image Nature of image At infinity At F Point-sized Real Beyond C Between F and C Small Real and inverted At C At C Same as that of the object Real and inverted Between C and F Behind C Enlarged Real and inverted At F At infinity Highly enlarged Real and inverted Between F and P Behind the mirror Enlarged Virtual and erect Images Formed by Convex Mirrors A convex mirror always produces virtual and erect images of very small size The images formed by a convex mirror are primarily classified in two ways

I When the object is at infinity In this case, the image appears to form at the focus This image is virtual, erect and very small in size

II When the object is between the pole (P) and a point X (X lies beyond C) In this case, the image is formed between the pole (P) and the focus (F), behind the mirror This image is virtual, erect and small in size These results are summarised in the following table Object position Image position Size of image Nature of image At infinity At F Extremely small Virtual and erect Between P and X (X lies beyond C) Between P and F Small Virtual and erect Regards

I. When the object is at infinity The light rays coming from infinity are parallel. When parallel light rays are incident on the reflecting surface of a concave mirror, they tend to meet at its focus after reflection. In this case, the image is formed at the focus, and is point-sized.
II. When the object is behind the centre of curvature
		In this case, the image is formed between the focus (F) and the centre of curvature (C). This image is real, inverted and diminished.
III. When the object is at the centre of curvature
In this case, the image is formed at the centre of curvature. This image is real, inverted and of the same size as the object.
IV. When the object is between the centre of curvature (C) and the focus (F)
	In this case, the image is formed behind the centre of curvature. This image is real, inverted and magnified.
V. When the object is at the focus (F)
In this case, the image is formed at infinity. This image is real, inverted and highly enlarged.
VI. When the object is placed between the focus (F) and the pole (P)
		In this case, the image is formed behind the mirror. This image is virtual, erect and magnified.

Object position	Image position	Size of image	Nature of image
At infinity	At F	Point-sized	Real
Beyond C	Between F and C	Small	Real and inverted
At C	At C	Same as that of the object	Real and inverted
Between C and F	Behind C	Enlarged	Real and inverted
At F	At infinity	Highly enlarged	Real and inverted
Between F and P	Behind the mirror	Enlarged	Virtual and erect