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​

An object weighs 40n in air, weighs 20n when submerged in water and 30n when submerged in a liquid of unknown density. what is the density of the liquid?

How do the kidneys affect homeostasis

On your wedding day your lover gives you a gold ring of mass 3.67 g. 48 years later its mass is 3.44 g. on the average how many atoms were abrated from the ring during each second of your marriage? the atomic mass of gold is 197 u. don't enter units