It is desired to obtain an erect image of an object, using a concave mirror of focal length of 12 cm.
(i) What should be the range of distance of an object placed in front of mirror?
(ii) Will the image be smaller or larger than the object?
Draw ray diagram for this situation also to justify your answer.
(iii) Where will be the image of this object be, if it is placed 24 cm in front of the mirror? Draw ray diagram to show the formation of image in this case.
Show the position of pole, principal focus & the centre of curvature in the above ray diagrams.
Answers
Explanation:
Solution
In a concave mirror an erect image will be obtained when the object is placed between pole and focus of the mirror. <br> Focal length, f = 12 cm <br> (i) Therefore, the range of object distance is between 0 cm to lt12 cm (from zero to less than 12 cm). <br> (ii) Image formed will be magnified, i.e., large than the object. <br> (iii) If the object is placed at 24 cm in front of the mirror, it means that object is placed at 2f, i.e., at the centre of curvature (at C) of the mirror.
Explanation:
you should study hard to score which language function used in this sentence'Or' presents a choice between the alternatives "study hard" and "fail the exam", and 'or' combines these two. 'Or' is an alternative conjunction that combines the clauses "You must study hard" and "you will fail the exam", hence option A is correct. 'You' is a pronoun that refers to the speaker, it does not combine the clauses, in fact it's a part of them, without which the meaning is incomplete. It's not a conjunction, hence option B is incorrect. 'Will' is an auxiliary verb that forms the tense of the sentence, it's not a conjunction as it does not combine the clauses. Hence option C is incorrect. 'Must' is a modal auxiliary that functions to form a mood or tense of a sentence, it does not combine the clauses, hence it isn't a conjunction,