20 अवतल दर्पण के सामने वस्तु को कहाँ रखा जाय ताकि प्रतिबिम्ब उल्टा. वास्तविक और सम्मान
आकार का बने।
(A)
(B)
अनंत पर
वक्रता केन्द्र पर
(D)
फोकस पर​

Get from the teacher they will you

The  moon has  insufficient gravity to retain an  atmosphere. we conclude that the moon has no atmosphere  because its gravitational field is too weak to  have  retained any  atmosphere  that it had over times comparable to the age of the solar system.

Ihad this on a test i just recently took on edgenuity and got 100%! the answer is b. no acceleration.