Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_23851574_2 (nationality_sponsors VARCHAR, mirror_type VARCHAR)

### Question ###
How many nationalities/sponsors for mirror/type schmidt uv?

### Accurate SQL ###

SELECT COUNT(nationality_sponsors) FROM table_23851574_2 WHERE mirror_type = "Schmidt UV"