Tuesday, November 9, 2010

Structure question -( concave mirror)

Percubaan SPM MRSM 2010


Diagram 1 shows an object placed in front of a mirror.
Rajah 1 menunjukkan satu objek diletakkan di hadapan sebuah cermin.
(a) Name the type of mirror shown in Diagram 1.
Namakan jenis kanta yang digunakan dalam Rajah 1.

Hints for solving the problem :
A convex mirror curves outwards.
A concave mirror curves inwards.
(b) Draw the image in the box given in Diagram 1.
Lukiskan imej dalam petak yang disediakan pada Rajah 1.

Hints for solving the problem :
Draw the image with its tail on the axis. The head is where the two reflected rays meet.
convex mirror typically make a virtual image.
A virtual image is shown using a dotted line.

(c) Based on Diagram 1, tick the correct statement about the image formed.
Berdasarkan Rajah 1. tandakan pada pernyataan yang betul mengenai imej yang terbentuk.

[] The image can be formed on a screen.
[] Imej boleh terbentuk pada skrin.
[] The image cannot be formed on a screen.
[] Imej tidak boleh terbentuk pada skrin.

Hints for solving the problem :
Real image can be displaced on a screen.
Virtual image can be seen by the observer but not be displaced on a screen.

(d) What happens to the size of the image if the object is placed at X?
Apakah yang terjadi pada saiz imej jika objek diletakkan pula di X ?
Hints for solving the problem :
The image appears larges in size when the object is nearer to the convex mirror.

Suggested answers:

(a) Convex mirror
(b)
(c)The image cannot be formed on a screen.
(d) Image is smaller than original size

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